13217813 has 8 divisors (see below), whose sum is σ = 15457728. Its totient is φ = 11065824.

The previous prime is 13217807. The next prime is 13217819. The reversal of 13217813 is 31871231.

It is an interprime number because it is at equal distance from previous prime (13217807) and next prime (13217819).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13217813 - 2¹⁸ = 12955669 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 (13217819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21656 + ... + 22257.

It is an arithmetic number, because the mean of its divisors is an integer number (1932216).

Almost surely, 2^13217813 is an apocalyptic number.

It is an amenable number.

13217813 is a deficient number, since it is larger than the sum of its proper divisors (2239915).

13217813 is an equidigital number, since it uses as much as digits as its factorization.

13217813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43963.

The product of its digits is 1008, while the sum is 26.

The square root of 13217813 is about 3635.6310318843. The cubic root of 13217813 is about 236.4394104509.

The spelling of 13217813 in words is "thirteen million, two hundred seventeen thousand, eight hundred thirteen".