13366991 has 12 divisors (see below), whose sum is σ = 14941752. Its totient is φ = 11946000.

The previous prime is 13366967. The next prime is 13367017. The reversal of 13366991 is 19966331.

It is not a de Polignac number, because 13366991 - 2¹⁴ = 13350607 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 (13366961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6476 + ... + 8286.

It is an arithmetic number, because the mean of its divisors is an integer number (1245146).

Almost surely, 2^13366991 is an apocalyptic number.

13366991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13366991 is a deficient number, since it is larger than the sum of its proper divisors (1574761).

13366991 is a wasteful number, since it uses less digits than its factorization.

13366991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894 (or 1883 counting only the distinct ones).

The product of its digits is 26244, while the sum is 38.

The square root of 13366991 is about 3656.0895776772. The cubic root of 13366991 is about 237.3255805253.

The spelling of 13366991 in words is "thirteen million, three hundred sixty-six thousand, nine hundred ninety-one".