13151681 has 4 divisors (see below), whose sum is σ = 13431552. Its totient is φ = 12871812.

The previous prime is 13151669. The next prime is 13151689. The reversal of 13151681 is 18615131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18615131 = 631 ⋅29501.

It is a cyclic number.

It is not a de Polignac number, because 13151681 - 2⁶ = 13151617 is a prime.

It is a super-2 number, since 2×13151681² = 345933426251522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13151681.

It is not an unprimeable number, because it can be changed into a prime (13151689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139865 + ... + 139958.

It is an arithmetic number, because the mean of its divisors is an integer number (3357888).

Almost surely, 2^13151681 is an apocalyptic number.

It is an amenable number.

13151681 is a deficient number, since it is larger than the sum of its proper divisors (279871).

13151681 is an equidigital number, since it uses as much as digits as its factorization.

13151681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279870.

The product of its digits is 720, while the sum is 26.

The square root of 13151681 is about 3626.5246448908. The cubic root of 13151681 is about 236.0444292968.

The spelling of 13151681 in words is "thirteen million, one hundred fifty-one thousand, six hundred eighty-one".