125131949 has 2 divisors, whose sum is σ = 125131950. Its totient is φ = 125131948.

The previous prime is 125131943. The next prime is 125131961. The reversal of 125131949 is 949131521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119202724 + 5929225 = 10918^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 125131949 - 2⁴ = 125131933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125131943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62565974 + 62565975.

It is an arithmetic number, because the mean of its divisors is an integer number (62565975).

Almost surely, 2^125131949 is an apocalyptic number.

It is an amenable number.

125131949 is a deficient number, since it is larger than the sum of its proper divisors (1).

125131949 is an equidigital number, since it uses as much as digits as its factorization.

125131949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 35.

The square root of 125131949 is about 11186.2392697457. The cubic root of 125131949 is about 500.1758701321.

The spelling of 125131949 in words is "one hundred twenty-five million, one hundred thirty-one thousand, nine hundred forty-nine".