12985491 has 4 divisors (see below), whose sum is σ = 17313992. Its totient is φ = 8656992.

The previous prime is 12985481. The next prime is 12985523. The reversal of 12985491 is 19458921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19458921 = 3 ⋅6486307.

It is not a de Polignac number, because 12985491 - 2²² = 8791187 is a prime.

It is a super-2 number, since 2×12985491² = 337245953022162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12985421) 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, 2164246 + ... + 2164251.

It is an arithmetic number, because the mean of its divisors is an integer number (4328498).

Almost surely, 2^12985491 is an apocalyptic number.

12985491 is a deficient number, since it is larger than the sum of its proper divisors (4328501).

12985491 is an equidigital number, since it uses as much as digits as its factorization.

12985491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328500.

The product of its digits is 25920, while the sum is 39.

The square root of 12985491 is about 3603.5386774669. The cubic root of 12985491 is about 235.0459605292.

The spelling of 12985491 in words is "twelve million, nine hundred eighty-five thousand, four hundred ninety-one".