125692991 has 2 divisors, whose sum is σ = 125692992. Its totient is φ = 125692990.

The previous prime is 125692981. The next prime is 125693011. The reversal of 125692991 is 199296521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125692991 - 2⁶ = 125692927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125692901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62846495 + 62846496.

It is an arithmetic number, because the mean of its divisors is an integer number (62846496).

Almost surely, 2^125692991 is an apocalyptic number.

125692991 is a deficient number, since it is larger than the sum of its proper divisors (1).

125692991 is an equidigital number, since it uses as much as digits as its factorization.

125692991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 44.

The square root of 125692991 is about 11211.2885521692. The cubic root of 125692991 is about 500.9222857320.

The spelling of 125692991 in words is "one hundred twenty-five million, six hundred ninety-two thousand, nine hundred ninety-one".