125791817 has 2 divisors, whose sum is σ = 125791818. Its totient is φ = 125791816.

The previous prime is 125791811. The next prime is 125791859. The reversal of 125791817 is 718197521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91087936 + 34703881 = 9544^2 + 5891^2 .

It is a cyclic number.

It is not a de Polignac number, because 125791817 - 2⁶ = 125791753 is a prime.

It is a super-2 number, since 2×125791817² = 31647162448322978, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125791811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62895908 + 62895909.

It is an arithmetic number, because the mean of its divisors is an integer number (62895909).

Almost surely, 2^125791817 is an apocalyptic number.

It is an amenable number.

125791817 is a deficient number, since it is larger than the sum of its proper divisors (1).

125791817 is an equidigital number, since it uses as much as digits as its factorization.

125791817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 41.

The square root of 125791817 is about 11215.6951188948. The cubic root of 125791817 is about 501.0535345707.

The spelling of 125791817 in words is "one hundred twenty-five million, seven hundred ninety-one thousand, eight hundred seventeen".