12635491 has 4 divisors (see below), whose sum is σ = 13784184. Its totient is φ = 11486800.

The previous prime is 12635461. The next prime is 12635509. The reversal of 12635491 is 19453621.

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 12635491 - 2⁵ = 12635459 is a prime.

It is a super-2 number, since 2×12635491² = 319311265622162, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12635411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 574330 + ... + 574351.

It is an arithmetic number, because the mean of its divisors is an integer number (3446046).

Almost surely, 2^12635491 is an apocalyptic number.

12635491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12635491 is a deficient number, since it is larger than the sum of its proper divisors (1148693).

12635491 is a wasteful number, since it uses less digits than its factorization.

12635491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148692.

The product of its digits is 6480, while the sum is 31.

The square root of 12635491 is about 3554.6435826957. The cubic root of 12635491 is about 232.9149548096.

The spelling of 12635491 in words is "twelve million, six hundred thirty-five thousand, four hundred ninety-one".