725408991 has 6 divisors (see below), whose sum is σ = 1047813000. Its totient is φ = 483605988.

The previous prime is 725408977. The next prime is 725408993. The reversal of 725408991 is 199804527.

It is not a de Polignac number, because 725408991 - 2⁷ = 725408863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725408993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40300491 + ... + 40300508.

It is an arithmetic number, because the mean of its divisors is an integer number (174635500).

Almost surely, 2^725408991 is an apocalyptic number.

725408991 is a deficient number, since it is larger than the sum of its proper divisors (322404009).

725408991 is a wasteful number, since it uses less digits than its factorization.

725408991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80601005 (or 80601002 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 725408991 is about 26933.4177370790. The cubic root of 725408991 is about 898.5197853694.

The spelling of 725408991 in words is "seven hundred twenty-five million, four hundred eight thousand, nine hundred ninety-one".