125656631 has 2 divisors, whose sum is σ = 125656632. Its totient is φ = 125656630.

The previous prime is 125656603. The next prime is 125656637. The reversal of 125656631 is 136656521.

It is a strong prime.

It is an emirp because it is prime and its reverse (136656521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125656631 - 2¹⁴ = 125640247 is a prime.

It is a super-2 number, since 2×125656631² = 31579177828540322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 125656591 and 125656600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125656637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62828315 + 62828316.

It is an arithmetic number, because the mean of its divisors is an integer number (62828316).

Almost surely, 2^125656631 is an apocalyptic number.

125656631 is a deficient number, since it is larger than the sum of its proper divisors (1).

125656631 is an equidigital number, since it uses as much as digits as its factorization.

125656631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 35.

The square root of 125656631 is about 11209.6668549962. Note that the first 3 decimals coincide. The cubic root of 125656631 is about 500.8739794298.

The spelling of 125656631 in words is "one hundred twenty-five million, six hundred fifty-six thousand, six hundred thirty-one".