725445531 has 16 divisors (see below), whose sum is σ = 1077073920. Its totient is φ = 482577480.

The previous prime is 725445499. The next prime is 725445541. The reversal of 725445531 is 135544527.

725445531 is a `hidden beast` number, since 72 + 54 + 4 + 5 + 531 = 666.

It is not a de Polignac number, because 725445531 - 2⁵ = 725445499 is a prime.

It is a super-2 number, since 2×725445531² = 1052542436895743922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (725445541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16515 + ... + 41516.

It is an arithmetic number, because the mean of its divisors is an integer number (67317120).

Almost surely, 2^725445531 is an apocalyptic number.

725445531 is a deficient number, since it is larger than the sum of its proper divisors (351628389).

725445531 is a wasteful number, since it uses less digits than its factorization.

725445531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58503 (or 58497 counting only the distinct ones).

The product of its digits is 84000, while the sum is 36.

The square root of 725445531 is about 26934.0960679953. The cubic root of 725445531 is about 898.5348717378.

The spelling of 725445531 in words is "seven hundred twenty-five million, four hundred forty-five thousand, five hundred thirty-one".