12540131 has 4 divisors (see below), whose sum is σ = 12553872. Its totient is φ = 12526392.

The previous prime is 12540127. The next prime is 12540149. The reversal of 12540131 is 13104521.

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

It is a cyclic number.

It is not a de Polignac number, because 12540131 - 2² = 12540127 is a prime.

It is a super-2 number, since 2×12540131² = 314509770994322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12540181) 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, 5396 + ... + 7361.

It is an arithmetic number, because the mean of its divisors is an integer number (3138468).

Almost surely, 2^12540131 is an apocalyptic number.

12540131 is a deficient number, since it is larger than the sum of its proper divisors (13741).

12540131 is an equidigital number, since it uses as much as digits as its factorization.

12540131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13740.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 12540131 is about 3541.2047385036. The cubic root of 12540131 is about 232.3275385018.

Adding to 12540131 its reverse (13104521), we get a palindrome (25644652).

The spelling of 12540131 in words is "twelve million, five hundred forty thousand, one hundred thirty-one".