126390031 has 2 divisors, whose sum is σ = 126390032. Its totient is φ = 126390030.

The previous prime is 126390023. The next prime is 126390049. The reversal of 126390031 is 130093621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126390031 - 2³ = 126390023 is a prime.

It is a super-2 number, since 2×126390031² = 31948879872361922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 126389978 and 126390005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126393031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63195015 + 63195016.

It is an arithmetic number, because the mean of its divisors is an integer number (63195016).

Almost surely, 2^126390031 is an apocalyptic number.

126390031 is a deficient number, since it is larger than the sum of its proper divisors (1).

126390031 is an equidigital number, since it uses as much as digits as its factorization.

126390031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 126390031 is about 11242.3320979235. The cubic root of 126390031 is about 501.8465468015.

The spelling of 126390031 in words is "one hundred twenty-six million, three hundred ninety thousand, thirty-one".