125157221 has 12 divisors (see below), whose sum is σ = 148341132. Its totient is φ = 105251328.

The previous prime is 125157217. The next prime is 125157223. The reversal of 125157221 is 122751521.

It can be written as a sum of positive squares in 2 ways, for example, as 91968100 + 33189121 = 9590^2 + 5761^2 .

It is not a de Polignac number, because 125157221 - 2² = 125157217 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 (125157223) 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 11 ways as a sum of consecutive naturals, for example, 21500 + ... + 26693.

It is an arithmetic number, because the mean of its divisors is an integer number (12361761).

Almost surely, 2^125157221 is an apocalyptic number.

It is an amenable number.

125157221 is a deficient number, since it is larger than the sum of its proper divisors (23183911).

125157221 is an equidigital number, since it uses as much as digits as its factorization.

125157221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48260 (or 48253 counting only the distinct ones).

The product of its digits is 1400, while the sum is 26.

The square root of 125157221 is about 11187.3688148733. The cubic root of 125157221 is about 500.2095401736.

The spelling of 125157221 in words is "one hundred twenty-five million, one hundred fifty-seven thousand, two hundred twenty-one".