709749201891 has 4 divisors (see below), whose sum is σ = 946332269192. Its totient is φ = 473166134592.

The previous prime is 709749201883. The next prime is 709749201893. The reversal of 709749201891 is 198102947907.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 709749201891 - 2³ = 709749201883 is a prime.

It is a super-2 number, since 2×709749201891² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (709749201893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118291533646 + ... + 118291533651.

It is an arithmetic number, because the mean of its divisors is an integer number (236583067298).

Almost surely, 2^709749201891 is an apocalyptic number.

709749201891 is a deficient number, since it is larger than the sum of its proper divisors (236583067301).

709749201891 is a wasteful number, since it uses less digits than its factorization.

709749201891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236583067300.

The product of its (nonzero) digits is 2286144, while the sum is 57.

The spelling of 709749201891 in words is "seven hundred nine billion, seven hundred forty-nine million, two hundred one thousand, eight hundred ninety-one".