125845917931 has 2 divisors, whose sum is σ = 125845917932. Its totient is φ = 125845917930.

The previous prime is 125845917929. The next prime is 125845918043. The reversal of 125845917931 is 139719548521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125845917931 - 2¹ = 125845917929 is a prime.

It is a super-2 number, since 2×125845917931² (a number of 23 digits) contains 22 as substring.

Together with 125845917929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (125845918931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62922958965 + 62922958966.

It is an arithmetic number, because the mean of its divisors is an integer number (62922958966).

Almost surely, 2^125845917931 is an apocalyptic number.

125845917931 is a deficient number, since it is larger than the sum of its proper divisors (1).

125845917931 is an equidigital number, since it uses as much as digits as its factorization.

125845917931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 55.

The spelling of 125845917931 in words is "one hundred twenty-five billion, eight hundred forty-five million, nine hundred seventeen thousand, nine hundred thirty-one".