13051691 has 4 divisors (see below), whose sum is σ = 13059552. Its totient is φ = 13043832.

The previous prime is 13051681. The next prime is 13051693. The reversal of 13051691 is 19615031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13051691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13051691.

It is not an unprimeable number, because it can be changed into a prime (13051693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356 + ... + 5121.

It is an arithmetic number, because the mean of its divisors is an integer number (3264888).

Almost surely, 2^13051691 is an apocalyptic number.

13051691 is a deficient number, since it is larger than the sum of its proper divisors (7861).

13051691 is an equidigital number, since it uses as much as digits as its factorization.

13051691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7860.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 13051691 is about 3612.7124159003. The cubic root of 13051691 is about 235.4447049314. Note that the first 3 decimals are identical.

The spelling of 13051691 in words is "thirteen million, fifty-one thousand, six hundred ninety-one".