725554637 has 2 divisors, whose sum is σ = 725554638. Its totient is φ = 725554636.

The previous prime is 725554607. The next prime is 725554673. The reversal of 725554637 is 736455527.

Together with next prime (725554673) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 574608841 + 150945796 = 23971^2 + 12286^2 .

It is a cyclic number.

It is not a de Polignac number, because 725554637 - 2¹⁰ = 725553613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725554607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362777318 + 362777319.

It is an arithmetic number, because the mean of its divisors is an integer number (362777319).

Almost surely, 2^725554637 is an apocalyptic number.

It is an amenable number.

725554637 is a deficient number, since it is larger than the sum of its proper divisors (1).

725554637 is an equidigital number, since it uses as much as digits as its factorization.

725554637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 882000, while the sum is 44.

The square root of 725554637 is about 26936.1214171603. The cubic root of 725554637 is about 898.5799156118.

The spelling of 725554637 in words is "seven hundred twenty-five million, five hundred fifty-four thousand, six hundred thirty-seven".