18311479 has 4 divisors (see below), whose sum is σ = 18321984. Its totient is φ = 18300976.

The previous prime is 18311471. The next prime is 18311509. The reversal of 18311479 is 97411381.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 97411381 = 239 ⋅407579.

It is a cyclic number.

It is not a de Polignac number, because 18311479 - 2³ = 18311471 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 (18311471) 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, 1942 + ... + 6355.

It is an arithmetic number, because the mean of its divisors is an integer number (4580496).

Almost surely, 2^18311479 is an apocalyptic number.

18311479 is a deficient number, since it is larger than the sum of its proper divisors (10505).

18311479 is an equidigital number, since it uses as much as digits as its factorization.

18311479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10504.

The product of its digits is 6048, while the sum is 34.

The square root of 18311479 is about 4279.1913955793. The cubic root of 18311479 is about 263.5771803482.

The spelling of 18311479 in words is "eighteen million, three hundred eleven thousand, four hundred seventy-nine".