13961691 has 12 divisors (see below), whose sum is σ = 20712432. Its totient is φ = 9056016.

The previous prime is 13961683. The next prime is 13961693. The reversal of 13961691 is 19616931.

13961691 is a `hidden beast` number, since 1 + 39 + 616 + 9 + 1 = 666.

It is not a de Polignac number, because 13961691 - 2³ = 13961683 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (13961693) 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 11 ways as a sum of consecutive naturals, for example, 20631 + ... + 21296.

It is an arithmetic number, because the mean of its divisors is an integer number (1726036).

Almost surely, 2^13961691 is an apocalyptic number.

13961691 is a deficient number, since it is larger than the sum of its proper divisors (6750741).

13961691 is a wasteful number, since it uses less digits than its factorization.

13961691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41970 (or 41967 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 13961691 is about 3736.5346244883. The cubic root of 13961691 is about 240.7941919310.

The spelling of 13961691 in words is "thirteen million, nine hundred sixty-one thousand, six hundred ninety-one".