125730991 has 2 divisors, whose sum is σ = 125730992. Its totient is φ = 125730990.

The previous prime is 125730977. The next prime is 125731007. The reversal of 125730991 is 199037521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125730991 - 2²⁵ = 92176559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125730991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125730901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62865495 + 62865496.

It is an arithmetic number, because the mean of its divisors is an integer number (62865496).

Almost surely, 2^125730991 is an apocalyptic number.

125730991 is a deficient number, since it is larger than the sum of its proper divisors (1).

125730991 is an equidigital number, since it uses as much as digits as its factorization.

125730991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 125730991 is about 11212.9831445517. The cubic root of 125730991 is about 500.9727609118.

The spelling of 125730991 in words is "one hundred twenty-five million, seven hundred thirty thousand, nine hundred ninety-one".