13691255 has 4 divisors (see below), whose sum is σ = 16429512. Its totient is φ = 10953000.

The previous prime is 13691213. The next prime is 13691269. The reversal of 13691255 is 55219631.

13691255 = 661² + 662² + ... + 690².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55219631 = 137 ⋅403063.

It is not a de Polignac number, because 13691255 - 2¹⁸ = 13429111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1369121 + ... + 1369130.

It is an arithmetic number, because the mean of its divisors is an integer number (4107378).

Almost surely, 2^13691255 is an apocalyptic number.

13691255 is a deficient number, since it is larger than the sum of its proper divisors (2738257).

13691255 is an equidigital number, since it uses as much as digits as its factorization.

13691255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738256.

The product of its digits is 8100, while the sum is 32.

The square root of 13691255 is about 3700.1695907080. The cubic root of 13691255 is about 239.2293276848.

The spelling of 13691255 in words is "thirteen million, six hundred ninety-one thousand, two hundred fifty-five".