721574869 has 4 divisors (see below), whose sum is σ = 725745996. Its totient is φ = 717403744.

The previous prime is 721574857. The next prime is 721574881. The reversal of 721574869 is 968475127.

721574869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 968475127 = 89 ⋅10881743.

It is an interprime number because it is at equal distance from previous prime (721574857) and next prime (721574881).

It can be written as a sum of positive squares in 2 ways, for example, as 619362769 + 102212100 = 24887^2 + 10110^2 .

It is a cyclic number.

It is not a de Polignac number, because 721574869 - 2¹⁹ = 721050581 is a prime.

It is a super-2 number, since 2×721574869² = 1041340583144734322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721574849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2085304 + ... + 2085649.

It is an arithmetic number, because the mean of its divisors is an integer number (181436499).

Almost surely, 2^721574869 is an apocalyptic number.

It is an amenable number.

721574869 is a deficient number, since it is larger than the sum of its proper divisors (4171127).

721574869 is a wasteful number, since it uses less digits than its factorization.

721574869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4171126.

The product of its digits is 846720, while the sum is 49.

The square root of 721574869 is about 26862.1456514553. The cubic root of 721574869 is about 896.9339572650.

The spelling of 721574869 in words is "seven hundred twenty-one million, five hundred seventy-four thousand, eight hundred sixty-nine".