725271221 has 12 divisors (see below), whose sum is σ = 774376800. Its totient is φ = 679124160.

The previous prime is 725271191. The next prime is 725271233. The reversal of 725271221 is 122172527.

It is not a de Polignac number, because 725271221 - 2²⁶ = 658162357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25271221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51206 + ... + 63816.

It is an arithmetic number, because the mean of its divisors is an integer number (64531400).

Almost surely, 2^725271221 is an apocalyptic number.

It is an amenable number.

725271221 is a deficient number, since it is larger than the sum of its proper divisors (49105579).

725271221 is a wasteful number, since it uses less digits than its factorization.

725271221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12844 (or 12827 counting only the distinct ones).

The product of its digits is 3920, while the sum is 29.

The square root of 725271221 is about 26930.8600122610. The cubic root of 725271221 is about 898.4628993415.

The spelling of 725271221 in words is "seven hundred twenty-five million, two hundred seventy-one thousand, two hundred twenty-one".