12711531 has 24 divisors (see below), whose sum is σ = 20184384. Its totient is φ = 7091280.

The previous prime is 12711527. The next prime is 12711553. The reversal of 12711531 is 13511721.

It is a happy number.

It is not a de Polignac number, because 12711531 - 2² = 12711527 is a prime.

It is a super-2 number, since 2×12711531² = 323166040727922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 12711498 and 12711507.

It is not an unprimeable number, because it can be changed into a prime (12711131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5316 + ... + 7326.

It is an arithmetic number, because the mean of its divisors is an integer number (841016).

Almost surely, 2^12711531 is an apocalyptic number.

12711531 is a deficient number, since it is larger than the sum of its proper divisors (7472853).

12711531 is a wasteful number, since it uses less digits than its factorization.

12711531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071 (or 2064 counting only the distinct ones).

The product of its digits is 210, while the sum is 21.

The square root of 12711531 is about 3565.3234074905. The cubic root of 12711531 is about 233.3812457166.

The spelling of 12711531 in words is "twelve million, seven hundred eleven thousand, five hundred thirty-one".