125554221 has 12 divisors (see below), whose sum is σ = 195306748. Its totient is φ = 77264064.

The previous prime is 125554213. The next prime is 125554229. The reversal of 125554221 is 122455521.

It is an interprime number because it is at equal distance from previous prime (125554213) and next prime (125554229).

It can be written as a sum of positive squares in 2 ways, for example, as 4862025 + 120692196 = 2205^2 + 10986^2 .

It is not a de Polignac number, because 125554221 - 2³ = 125554213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125554229) 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, 536440 + ... + 536673.

Almost surely, 2^125554221 is an apocalyptic number.

It is an amenable number.

125554221 is a deficient number, since it is larger than the sum of its proper divisors (69752527).

125554221 is a wasteful number, since it uses less digits than its factorization.

125554221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073132 (or 1073129 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 125554221 is about 11205.0979915394. The cubic root of 125554221 is about 500.7378718878.

The spelling of 125554221 in words is "one hundred twenty-five million, five hundred fifty-four thousand, two hundred twenty-one".