709742881 has 3 divisors (see below), whose sum is σ = 709769523. Its totient is φ = 709716240.

The previous prime is 709742879. The next prime is 709742921. The reversal of 709742881 is 188247907.

The square root of 709742881 is 26641.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 188247907 = 1103 ⋅170669.

It can be written as a sum of positive squares in only one way, i.e., 44102881 + 665640000 = 6641^2 + 25800^2 .

It is not a de Polignac number, because 709742881 - 2¹ = 709742879 is a prime.

It is a super-2 number, since 2×709742881² = 1007469914260360322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (709742851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13321 + ... + 39961.

It is an arithmetic number, because the mean of its divisors is an integer number (236589841).

Almost surely, 2^709742881 is an apocalyptic number.

709742881 is the 26641-st square number.

709742881 is the 13321-st centered octagonal number.

It is an amenable number.

709742881 is a deficient number, since it is larger than the sum of its proper divisors (26642).

709742881 is an frugal number, since it uses more digits than its factorization.

709742881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53282 (or 26641 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 46.

The cubic root of 709742881 is about 892.0044377808.

It can be divided in two parts, 709 and 742881, that added together give a triangular number (743590 = T₁₂₁₉).

The spelling of 709742881 in words is "seven hundred nine million, seven hundred forty-two thousand, eight hundred eighty-one".