12491513 has 4 divisors (see below), whose sum is σ = 12581520. Its totient is φ = 12401508.

The previous prime is 12491497. The next prime is 12491537. The reversal of 12491513 is 31519421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31519421 = 109 ⋅289169.

It is a cyclic number.

It is not a de Polignac number, because 12491513 - 2⁴ = 12491497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12494513) 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, 44795 + ... + 45072.

It is an arithmetic number, because the mean of its divisors is an integer number (3145380).

Almost surely, 2^12491513 is an apocalyptic number.

It is an amenable number.

12491513 is a deficient number, since it is larger than the sum of its proper divisors (90007).

12491513 is an equidigital number, since it uses as much as digits as its factorization.

12491513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90006.

The product of its digits is 1080, while the sum is 26.

The square root of 12491513 is about 3534.3334590839. Note that the first 3 decimals coincide. The cubic root of 12491513 is about 232.0269055696.

The spelling of 12491513 in words is "twelve million, four hundred ninety-one thousand, five hundred thirteen".