125128831 has 2 divisors, whose sum is σ = 125128832. Its totient is φ = 125128830.

The previous prime is 125128819. The next prime is 125128837. The reversal of 125128831 is 138821521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125128831 is a prime.

It is a super-2 number, since 2×125128831² = 31314448694853122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 125128793 and 125128802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125128837) 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, 62564415 + 62564416.

It is an arithmetic number, because the mean of its divisors is an integer number (62564416).

Almost surely, 2^125128831 is an apocalyptic number.

125128831 is a deficient number, since it is larger than the sum of its proper divisors (1).

125128831 is an equidigital number, since it uses as much as digits as its factorization.

125128831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 31.

The square root of 125128831 is about 11186.0999012167. The cubic root of 125128831 is about 500.1717156874.

The spelling of 125128831 in words is "one hundred twenty-five million, one hundred twenty-eight thousand, eight hundred thirty-one".