125805913 has 2 divisors, whose sum is σ = 125805914. Its totient is φ = 125805912.

The previous prime is 125805893. The next prime is 125805923. The reversal of 125805913 is 319508521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88510464 + 37295449 = 9408^2 + 6107^2 .

It is a cyclic number.

It is not a de Polignac number, because 125805913 - 2⁵ = 125805881 is a prime.

It is not a weakly prime, because it can be changed into another prime (125805923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62902956 + 62902957.

It is an arithmetic number, because the mean of its divisors is an integer number (62902957).

Almost surely, 2^125805913 is an apocalyptic number.

It is an amenable number.

125805913 is a deficient number, since it is larger than the sum of its proper divisors (1).

125805913 is an equidigital number, since it uses as much as digits as its factorization.

125805913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 125805913 is about 11216.3235063901. The cubic root of 125805913 is about 501.0722495846.

The spelling of 125805913 in words is "one hundred twenty-five million, eight hundred five thousand, nine hundred thirteen".