123957731 has 2 divisors, whose sum is σ = 123957732. Its totient is φ = 123957730.

The previous prime is 123957677. The next prime is 123957749. The reversal of 123957731 is 137759321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123957731 is a prime.

It is a super-2 number, since 2×123957731² = 30731038149336722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123957781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61978865 + 61978866.

It is an arithmetic number, because the mean of its divisors is an integer number (61978866).

Almost surely, 2^123957731 is an apocalyptic number.

123957731 is a deficient number, since it is larger than the sum of its proper divisors (1).

123957731 is an equidigital number, since it uses as much as digits as its factorization.

123957731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39690, while the sum is 38.

The square root of 123957731 is about 11133.6306297631. The cubic root of 123957731 is about 498.6064275200.

The spelling of 123957731 in words is "one hundred twenty-three million, nine hundred fifty-seven thousand, seven hundred thirty-one".