125172221 has 16 divisors (see below), whose sum is σ = 133074480. Its totient is φ = 117573120.

The previous prime is 125172197. The next prime is 125172227. The reversal of 125172221 is 122271521.

It can be written as a sum of positive squares in 8 ways, for example, as 1406596 + 123765625 = 1186^2 + 11125^2 .

It is a cyclic number.

It is not a de Polignac number, because 125172221 - 2¹⁰ = 125171197 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 (125172227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164975 + ... + 165731.

It is an arithmetic number, because the mean of its divisors is an integer number (8317155).

Almost surely, 2^125172221 is an apocalyptic number.

It is an amenable number.

125172221 is a deficient number, since it is larger than the sum of its proper divisors (7902259).

125172221 is a wasteful number, since it uses less digits than its factorization.

125172221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944.

The product of its digits is 560, while the sum is 23.

The square root of 125172221 is about 11188.0391937104. The cubic root of 125172221 is about 500.2295226226.

The spelling of 125172221 in words is "one hundred twenty-five million, one hundred seventy-two thousand, two hundred twenty-one".