17311979 has 4 divisors (see below), whose sum is σ = 17355984. Its totient is φ = 17267976.

The previous prime is 17311969. The next prime is 17311991. The reversal of 17311979 is 97911371.

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 17311979 - 2¹⁶ = 17246443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17311969) 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, 21407 + ... + 22200.

It is an arithmetic number, because the mean of its divisors is an integer number (4338996).

Almost surely, 2^17311979 is an apocalyptic number.

17311979 is a deficient number, since it is larger than the sum of its proper divisors (44005).

17311979 is an equidigital number, since it uses as much as digits as its factorization.

17311979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44004.

The product of its digits is 11907, while the sum is 38.

The square root of 17311979 is about 4160.7666360900. The cubic root of 17311979 is about 258.6915475485.

The spelling of 17311979 in words is "seventeen million, three hundred eleven thousand, nine hundred seventy-nine".