125005091 has 2 divisors, whose sum is σ = 125005092. Its totient is φ = 125005090.

The previous prime is 125005081. The next prime is 125005099. The reversal of 125005091 is 190500521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125005091 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125005099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62502545 + 62502546.

It is an arithmetic number, because the mean of its divisors is an integer number (62502546).

Almost surely, 2^125005091 is an apocalyptic number.

125005091 is a deficient number, since it is larger than the sum of its proper divisors (1).

125005091 is an equidigital number, since it uses as much as digits as its factorization.

125005091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 125005091 is about 11180.5675616223. The cubic root of 125005091 is about 500.0067879078.

The spelling of 125005091 in words is "one hundred twenty-five million, five thousand, ninety-one".