125731601 has 2 divisors, whose sum is σ = 125731602. Its totient is φ = 125731600.

The previous prime is 125731591. The next prime is 125731657. The reversal of 125731601 is 106137521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96040000 + 29691601 = 9800^2 + 5449^2 .

It is a cyclic number.

It is not a de Polignac number, because 125731601 - 2²⁶ = 58622737 is a prime.

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 (125731681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62865800 + 62865801.

It is an arithmetic number, because the mean of its divisors is an integer number (62865801).

Almost surely, 2^125731601 is an apocalyptic number.

It is an amenable number.

125731601 is a deficient number, since it is larger than the sum of its proper divisors (1).

125731601 is an equidigital number, since it uses as much as digits as its factorization.

125731601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 125731601 is about 11213.0103451303. The cubic root of 125731601 is about 500.9735710883.

The spelling of 125731601 in words is "one hundred twenty-five million, seven hundred thirty-one thousand, six hundred one".