125742731 has 2 divisors, whose sum is σ = 125742732. Its totient is φ = 125742730.

The previous prime is 125742653. The next prime is 125742733. The reversal of 125742731 is 137247521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125742731 is a prime.

It is a super-2 number, since 2×125742731² = 31622468798676722, which contains 22 as substring.

Together with 125742733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125742733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62871365 + 62871366.

It is an arithmetic number, because the mean of its divisors is an integer number (62871366).

Almost surely, 2^125742731 is an apocalyptic number.

125742731 is a deficient number, since it is larger than the sum of its proper divisors (1).

125742731 is an equidigital number, since it uses as much as digits as its factorization.

125742731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 32.

The square root of 125742731 is about 11213.5066326284. The cubic root of 125742731 is about 500.9883530293.

The spelling of 125742731 in words is "one hundred twenty-five million, seven hundred forty-two thousand, seven hundred thirty-one".