125779831 has 2 divisors, whose sum is σ = 125779832. Its totient is φ = 125779830.

The previous prime is 125779813. The next prime is 125779877. The reversal of 125779831 is 138977521.

125779831 is nontrivially palindromic in base 16.

Together with previous prime (125779813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125779831 - 2¹⁷ = 125648759 is a prime.

It is a super-4 number, since 4×125779831⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125779811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62889915 + 62889916.

It is an arithmetic number, because the mean of its divisors is an integer number (62889916).

Almost surely, 2^125779831 is an apocalyptic number.

125779831 is a deficient number, since it is larger than the sum of its proper divisors (1).

125779831 is an equidigital number, since it uses as much as digits as its factorization.

125779831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The square root of 125779831 is about 11215.1607656779. The cubic root of 125779831 is about 501.0376198671.

The spelling of 125779831 in words is "one hundred twenty-five million, seven hundred seventy-nine thousand, eight hundred thirty-one".