125637881 has 2 divisors, whose sum is σ = 125637882. Its totient is φ = 125637880.

The previous prime is 125637877. The next prime is 125637907. The reversal of 125637881 is 188736521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103632400 + 22005481 = 10180^2 + 4691^2 .

It is a cyclic number.

It is not a de Polignac number, because 125637881 - 2² = 125637877 is a prime.

It is a super-2 number, since 2×125637881² = 31569754284340322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (125637821) 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, 62818940 + 62818941.

It is an arithmetic number, because the mean of its divisors is an integer number (62818941).

Almost surely, 2^125637881 is an apocalyptic number.

It is an amenable number.

125637881 is a deficient number, since it is larger than the sum of its proper divisors (1).

125637881 is an equidigital number, since it uses as much as digits as its factorization.

125637881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 125637881 is about 11208.8304920719. The cubic root of 125637881 is about 500.8490653599.

The spelling of 125637881 in words is "one hundred twenty-five million, six hundred thirty-seven thousand, eight hundred eighty-one".