12540311 has 4 divisors (see below), whose sum is σ = 14331792. Its totient is φ = 10748832.

The previous prime is 12540263. The next prime is 12540317. The reversal of 12540311 is 11304521.

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-12540311 is a prime.

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 12540311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540317) 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, 895730 + ... + 895743.

It is an arithmetic number, because the mean of its divisors is an integer number (3582948).

Almost surely, 2^12540311 is an apocalyptic number.

12540311 is a deficient number, since it is larger than the sum of its proper divisors (1791481).

12540311 is an equidigital number, since it uses as much as digits as its factorization.

12540311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791480.

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

The square root of 12540311 is about 3541.2301534919. The cubic root of 12540311 is about 232.3286500999.

Adding to 12540311 its reverse (11304521), we get a palindrome (23844832).

The spelling of 12540311 in words is "twelve million, five hundred forty thousand, three hundred eleven".