13691357 has 4 divisors (see below), whose sum is σ = 13722300. Its totient is φ = 13660416.

The previous prime is 13691351. The next prime is 13691387. The reversal of 13691357 is 75319631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75319631 = 383 ⋅196657.

It can be written as a sum of positive squares in 2 ways, for example, as 4044121 + 9647236 = 2011^2 + 3106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13691357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13691351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14798 + ... + 15695.

It is an arithmetic number, because the mean of its divisors is an integer number (3430575).

Almost surely, 2^13691357 is an apocalyptic number.

It is an amenable number.

13691357 is a deficient number, since it is larger than the sum of its proper divisors (30943).

13691357 is an equidigital number, since it uses as much as digits as its factorization.

13691357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30942.

The product of its digits is 17010, while the sum is 35.

The square root of 13691357 is about 3700.1833738343. The cubic root of 13691357 is about 239.2299217704.

The spelling of 13691357 in words is "thirteen million, six hundred ninety-one thousand, three hundred fifty-seven".