725813831 has 4 divisors (see below), whose sum is σ = 725883000. Its totient is φ = 725744664.

The previous prime is 725813797. The next prime is 725813833. The reversal of 725813831 is 138318527.

It is a happy 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: 138318527 = 23 ⋅6013849.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725813831 is a prime.

It is a super-2 number, since 2×725813831² = 1053611434541793122, 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 (725813833) 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 3 ways as a sum of consecutive naturals, for example, 15236 + ... + 41033.

It is an arithmetic number, because the mean of its divisors is an integer number (181470750).

Almost surely, 2^725813831 is an apocalyptic number.

725813831 is a deficient number, since it is larger than the sum of its proper divisors (69169).

725813831 is a wasteful number, since it uses less digits than its factorization.

725813831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69168.

The product of its digits is 40320, while the sum is 38.

The square root of 725813831 is about 26940.9322592964. The cubic root of 725813831 is about 898.6869044734.

The spelling of 725813831 in words is "seven hundred twenty-five million, eight hundred thirteen thousand, eight hundred thirty-one".