13613391 has 24 divisors (see below), whose sum is σ = 21590400. Its totient is φ = 8197200.

The previous prime is 13613357. The next prime is 13613393. The reversal of 13613391 is 19331631.

13613391 is a `hidden beast` number, since 13 + 613 + 39 + 1 = 666.

It is not a de Polignac number, because 13613391 - 2¹⁰ = 13612367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13613393) 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, 19356 + ... + 20046.

It is an arithmetic number, because the mean of its divisors is an integer number (899600).

Almost surely, 2^13613391 is an apocalyptic number.

13613391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13613391 is a deficient number, since it is larger than the sum of its proper divisors (7977009).

13613391 is a wasteful number, since it uses less digits than its factorization.

13613391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907 (or 904 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 13613391 is about 3689.6329085696. The cubic root of 13613391 is about 238.7749554975.

The spelling of 13613391 in words is "thirteen million, six hundred thirteen thousand, three hundred ninety-one".