13217791 has 4 divisors (see below), whose sum is σ = 13248072. Its totient is φ = 13187512.

The previous prime is 13217783. The next prime is 13217803. The reversal of 13217791 is 19771231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13217791 - 2³ = 13217783 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 (13217731) 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, 14476 + ... + 15361.

It is an arithmetic number, because the mean of its divisors is an integer number (3312018).

Almost surely, 2^13217791 is an apocalyptic number.

13217791 is a deficient number, since it is larger than the sum of its proper divisors (30281).

13217791 is an equidigital number, since it uses as much as digits as its factorization.

13217791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30280.

The product of its digits is 2646, while the sum is 31.

The square root of 13217791 is about 3635.6280062735. The cubic root of 13217791 is about 236.4392792726.

The spelling of 13217791 in words is "thirteen million, two hundred seventeen thousand, seven hundred ninety-one".