18311697 has 8 divisors (see below), whose sum is σ = 27128480. Its totient is φ = 12207780.

The previous prime is 18311693. The next prime is 18311719. The reversal of 18311697 is 79611381.

It is not a de Polignac number, because 18311697 - 2² = 18311693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18311693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339079 + ... + 339132.

It is an arithmetic number, because the mean of its divisors is an integer number (3391060).

Almost surely, 2^18311697 is an apocalyptic number.

It is an amenable number.

18311697 is a deficient number, since it is larger than the sum of its proper divisors (8816783).

18311697 is an equidigital number, since it uses as much as digits as its factorization.

18311697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678220 (or 678214 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 18311697 is about 4279.2168676056. The cubic root of 18311697 is about 263.5782263150.

The spelling of 18311697 in words is "eighteen million, three hundred eleven thousand, six hundred ninety-seven".