12513991 has 8 divisors (see below), whose sum is σ = 14407200. Its totient is φ = 10647168.

The previous prime is 12513983. The next prime is 12514003. The reversal of 12513991 is 19931521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12513991 - 2³ = 12513983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12513901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5566 + ... + 7483.

It is an arithmetic number, because the mean of its divisors is an integer number (1800900).

Almost surely, 2^12513991 is an apocalyptic number.

12513991 is a deficient number, since it is larger than the sum of its proper divisors (1893209).

12513991 is a wasteful number, since it uses less digits than its factorization.

12513991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13193.

The product of its digits is 2430, while the sum is 31.

The square root of 12513991 is about 3537.5119787783. The cubic root of 12513991 is about 232.1659966881.

The spelling of 12513991 in words is "twelve million, five hundred thirteen thousand, nine hundred ninety-one".