126315531 has 12 divisors (see below), whose sum is σ = 189213752. Its totient is φ = 84210192.

The previous prime is 126315529. The next prime is 126315551. The reversal of 126315531 is 135513621.

126315531 is a `hidden beast` number, since 126 + 3 + 1 + 5 + 531 = 666.

It is not a de Polignac number, because 126315531 - 2¹ = 126315529 is a prime.

It is a super-2 number, since 2×126315531² = 31911226743623922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126315495 and 126315504.

It is not an unprimeable number, because it can be changed into a prime (126315551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259666 + ... + 260151.

Almost surely, 2^126315531 is an apocalyptic number.

126315531 is a deficient number, since it is larger than the sum of its proper divisors (62898221).

126315531 is an frugal number, since it uses more digits than its factorization.

126315531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519832 (or 519820 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 126315531 is about 11239.0182400421. The cubic root of 126315531 is about 501.7479237381.

The spelling of 126315531 in words is "one hundred twenty-six million, three hundred fifteen thousand, five hundred thirty-one".