725588681 has 4 divisors (see below), whose sum is σ = 725993364. Its totient is φ = 725184000.

The previous prime is 725588639. The next prime is 725588723. The reversal of 725588681 is 186885527.

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

It is an interprime number because it is at equal distance from previous prime (725588639) and next prime (725588723).

It can be written as a sum of positive squares in 2 ways, for example, as 65869456 + 659719225 = 8116^2 + 25685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725588681 is a prime.

It is a super-2 number, since 2×725588681² = 1052957867990639522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725588621) 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, 199640 + ... + 203241.

It is an arithmetic number, because the mean of its divisors is an integer number (181498341).

Almost surely, 2^725588681 is an apocalyptic number.

It is an amenable number.

725588681 is a deficient number, since it is larger than the sum of its proper divisors (404683).

725588681 is a wasteful number, since it uses less digits than its factorization.

725588681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404682.

The product of its digits is 1075200, while the sum is 50.

The square root of 725588681 is about 26936.7533492810. The cubic root of 725588681 is about 898.5939695850.

The spelling of 725588681 in words is "seven hundred twenty-five million, five hundred eighty-eight thousand, six hundred eighty-one".