725099681 has 4 divisors (see below), whose sum is σ = 725265072. Its totient is φ = 724934292.

The previous prime is 725099659. The next prime is 725099701. The reversal of 725099681 is 186990527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 725099681 - 2¹⁸ = 724837537 is a prime.

It is a super-2 number, since 2×725099681² = 1051539094772603522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (725099281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75935 + ... + 84948.

It is an arithmetic number, because the mean of its divisors is an integer number (181316268).

Almost surely, 2^725099681 is an apocalyptic number.

It is an amenable number.

725099681 is a deficient number, since it is larger than the sum of its proper divisors (165391).

725099681 is a wasteful number, since it uses less digits than its factorization.

725099681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165390.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 725099681 is about 26927.6750017524. The cubic root of 725099681 is about 898.3920594158.

The spelling of 725099681 in words is "seven hundred twenty-five million, ninety-nine thousand, six hundred eighty-one".