125831861 has 2 divisors, whose sum is σ = 125831862. Its totient is φ = 125831860.

The previous prime is 125831843. The next prime is 125831869. The reversal of 125831861 is 168138521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124768900 + 1062961 = 11170^2 + 1031^2 .

It is a cyclic number.

It is not a de Polignac number, because 125831861 - 2²² = 121637557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125831869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62915930 + 62915931.

It is an arithmetic number, because the mean of its divisors is an integer number (62915931).

Almost surely, 2^125831861 is an apocalyptic number.

It is an amenable number.

125831861 is a deficient number, since it is larger than the sum of its proper divisors (1).

125831861 is an equidigital number, since it uses as much as digits as its factorization.

125831861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 35.

The square root of 125831861 is about 11217.4801537600. The cubic root of 125831861 is about 501.1066966378.

The spelling of 125831861 in words is "one hundred twenty-five million, eight hundred thirty-one thousand, eight hundred sixty-one".