13691951 has 16 divisors (see below), whose sum is σ = 17740800. Its totient is φ = 10261728.

The previous prime is 13691947. The next prime is 13691963. The reversal of 13691951 is 15919631.

It is a cyclic number.

It is not a de Polignac number, because 13691951 - 2² = 13691947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13691921) 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 15 ways as a sum of consecutive naturals, for example, 2231 + ... + 5688.

It is an arithmetic number, because the mean of its divisors is an integer number (1108800).

Almost surely, 2^13691951 is an apocalyptic number.

13691951 is a deficient number, since it is larger than the sum of its proper divisors (4048849).

13691951 is a wasteful number, since it uses less digits than its factorization.

13691951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7958.

The product of its digits is 7290, while the sum is 35.

The square root of 13691951 is about 3700.2636392560. The cubic root of 13691951 is about 239.2333813865.

The spelling of 13691951 in words is "thirteen million, six hundred ninety-one thousand, nine hundred fifty-one".