125821172 has 6 divisors (see below), whose sum is σ = 220187058. Its totient is φ = 62910584.

The previous prime is 125821151. The next prime is 125821181. The reversal of 125821172 is 271128521.

It can be written as a sum of positive squares in only one way, i.e., 81252196 + 44568976 = 9014^2 + 6676^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15727643 + ... + 15727650.

It is an arithmetic number, because the mean of its divisors is an integer number (36697843).

Almost surely, 2^125821172 is an apocalyptic number.

It is an amenable number.

125821172 is a deficient number, since it is larger than the sum of its proper divisors (94365886).

125821172 is a wasteful number, since it uses less digits than its factorization.

125821172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31455297 (or 31455295 counting only the distinct ones).

The product of its digits is 2240, while the sum is 29.

The square root of 125821172 is about 11217.0036997409. The cubic root of 125821172 is about 501.0925071177.

Adding to 125821172 its reverse (271128521), we get a palindrome (396949693).

The spelling of 125821172 in words is "one hundred twenty-five million, eight hundred twenty-one thousand, one hundred seventy-two".