220725891 has 14 divisors (see below), whose sum is σ = 330938540. Its totient is φ = 147150108.

The previous prime is 220725887. The next prime is 220725929. The reversal of 220725891 is 198527022.

220725891 is a `hidden beast` number, since 2 + 2 + 0 + 72 + 589 + 1 = 666.

It is not a de Polignac number, because 220725891 - 2² = 220725887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220725811) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 150661 + ... + 152118.

Almost surely, 2^220725891 is an apocalyptic number.

220725891 is a deficient number, since it is larger than the sum of its proper divisors (110212649).

220725891 is an frugal number, since it uses more digits than its factorization.

220725891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302797 (or 302782 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 220725891 is about 14856.8466035024. The cubic root of 220725891 is about 604.3442942628.

The spelling of 220725891 in words is "two hundred twenty million, seven hundred twenty-five thousand, eight hundred ninety-one".