725605831 has 2 divisors, whose sum is σ = 725605832. Its totient is φ = 725605830.

The previous prime is 725605813. The next prime is 725605847. The reversal of 725605831 is 138506527.

Together with previous prime (725605813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (138506527) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 725605831 - 2⁵ = 725605799 is a prime.

It is a super-2 number, since 2×725605831² = 1053007643962401122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725605861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362802915 + 362802916.

It is an arithmetic number, because the mean of its divisors is an integer number (362802916).

Almost surely, 2^725605831 is an apocalyptic number.

725605831 is the 17037-th centered pentagonal number.

725605831 is a deficient number, since it is larger than the sum of its proper divisors (1).

725605831 is an equidigital number, since it uses as much as digits as its factorization.

725605831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 725605831 is about 26937.0716856900. The cubic root of 725605831 is about 898.6010492457.

The spelling of 725605831 in words is "seven hundred twenty-five million, six hundred five thousand, eight hundred thirty-one".