725781231 has 24 divisors (see below), whose sum is σ = 1239432480. Its totient is φ = 400430016.

The previous prime is 725781223. The next prime is 725781239. The reversal of 725781231 is 132187527.

725781231 is a `hidden beast` number, since 72 + 578 + 12 + 3 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (725781223) and next prime (725781239).

It is not a de Polignac number, because 725781231 - 2³ = 725781223 is a prime.

It is a super-2 number, since 2×725781231² = 1053516790543750722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725781239) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196800 + ... + 200453.

It is an arithmetic number, because the mean of its divisors is an integer number (51643020).

Almost surely, 2^725781231 is an apocalyptic number.

725781231 is a deficient number, since it is larger than the sum of its proper divisors (513651249).

725781231 is a wasteful number, since it uses less digits than its factorization.

725781231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397295 (or 397292 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 725781231 is about 26940.3272251842. The cubic root of 725781231 is about 898.6734494016.

It can be divided in two parts, 7257 and 81231, that added together give a palindrome (88488).

The spelling of 725781231 in words is "seven hundred twenty-five million, seven hundred eighty-one thousand, two hundred thirty-one".