12401531531 has 4 divisors (see below), whose sum is σ = 12665393952. Its totient is φ = 12137669112.

The previous prime is 12401531503. The next prime is 12401531563. The reversal of 12401531531 is 13513510421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12401531531 is a prime.

It is a super-2 number, since 2×12401531531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12401531531.

It is not an unprimeable number, because it can be changed into a prime (12401531581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131931140 + ... + 131931233.

It is an arithmetic number, because the mean of its divisors is an integer number (3166348488).

Almost surely, 2^12401531531 is an apocalyptic number.

12401531531 is a deficient number, since it is larger than the sum of its proper divisors (263862421).

12401531531 is an equidigital number, since it uses as much as digits as its factorization.

12401531531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263862420.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 12401531531 in words is "twelve billion, four hundred one million, five hundred thirty-one thousand, five hundred thirty-one".