725178637 has 2 divisors, whose sum is σ = 725178638. Its totient is φ = 725178636.

The previous prime is 725178631. The next prime is 725178653. The reversal of 725178637 is 736871527.

725178637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664556841 + 60621796 = 25779^2 + 7786^2 .

It is a cyclic number.

It is not a de Polignac number, because 725178637 - 2¹¹ = 725176589 is a prime.

It is a super-2 number, since 2×725178637² = 1051768111122355538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725178631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362589318 + 362589319.

It is an arithmetic number, because the mean of its divisors is an integer number (362589319).

Almost surely, 2^725178637 is an apocalyptic number.

It is an amenable number.

725178637 is a deficient number, since it is larger than the sum of its proper divisors (1).

725178637 is an equidigital number, since it uses as much as digits as its factorization.

725178637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 46.

The square root of 725178637 is about 26929.1410371738. The cubic root of 725178637 is about 898.4246668263.

The spelling of 725178637 in words is "seven hundred twenty-five million, one hundred seventy-eight thousand, six hundred thirty-seven".