725978131 has 2 divisors, whose sum is σ = 725978132. Its totient is φ = 725978130.

The previous prime is 725978129. The next prime is 725978171. The reversal of 725978131 is 131879527.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 725978131 - 2¹ = 725978129 is a prime.

It is a super-2 number, since 2×725978131² = 1054088493380506322, which contains 22 as substring.

Together with 725978129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (725978111) 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 as a sum of consecutive naturals, namely, 362989065 + 362989066.

It is an arithmetic number, because the mean of its divisors is an integer number (362989066).

Almost surely, 2^725978131 is an apocalyptic number.

725978131 is a deficient number, since it is larger than the sum of its proper divisors (1).

725978131 is an equidigital number, since it uses as much as digits as its factorization.

725978131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 43.

The square root of 725978131 is about 26943.9813502014. The cubic root of 725978131 is about 898.7547102533.

The spelling of 725978131 in words is "seven hundred twenty-five million, nine hundred seventy-eight thousand, one hundred thirty-one".