13437691 has 2 divisors, whose sum is σ = 13437692. Its totient is φ = 13437690.

The previous prime is 13437679. The next prime is 13437703. The reversal of 13437691 is 19673431.

13437691 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (13437679) and next prime (13437703).

It is a cyclic number.

It is not a de Polignac number, because 13437691 - 2⁷ = 13437563 is a prime.

It is a super-2 number, since 2×13437691² = 361143078822962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13437631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6718845 + 6718846.

It is an arithmetic number, because the mean of its divisors is an integer number (6718846).

Almost surely, 2^13437691 is an apocalyptic number.

13437691 is a deficient number, since it is larger than the sum of its proper divisors (1).

13437691 is an equidigital number, since it uses as much as digits as its factorization.

13437691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 34.

The square root of 13437691 is about 3665.7456267450. The cubic root of 13437691 is about 237.7432617397.

The spelling of 13437691 in words is "thirteen million, four hundred thirty-seven thousand, six hundred ninety-one".