13491863 has 24 divisors (see below), whose sum is σ = 17964576. Its totient is φ = 9884160.

The previous prime is 13491859. The next prime is 13491871. The reversal of 13491863 is 36819431.

13491863 = 312² + 313² + ... + 413².

It is not a de Polignac number, because 13491863 - 2² = 13491859 is a prime.

Its product of digits (15552) is a multiple of the sum of its prime divisors (972).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13491833) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13931 + ... + 14867.

It is an arithmetic number, because the mean of its divisors is an integer number (748524).

Almost surely, 2^13491863 is an apocalyptic number.

13491863 is a deficient number, since it is larger than the sum of its proper divisors (4472713).

13491863 is a wasteful number, since it uses less digits than its factorization.

13491863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983 (or 972 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 13491863 is about 3673.1271418234. The cubic root of 13491863 is about 238.0623086161.

The spelling of 13491863 in words is "thirteen million, four hundred ninety-one thousand, eight hundred sixty-three".