18312737 has 2 divisors, whose sum is σ = 18312738. Its totient is φ = 18312736.

The previous prime is 18312733. The next prime is 18312769. The reversal of 18312737 is 73721381.

It is an a-pointer prime, because the next prime (18312769) can be obtained adding 18312737 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18284176 + 28561 = 4276^2 + 169^2 .

It is an emirp because it is prime and its reverse (73721381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18312737 - 2² = 18312733 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18312731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9156368 + 9156369.

It is an arithmetic number, because the mean of its divisors is an integer number (9156369).

Almost surely, 2^18312737 is an apocalyptic number.

It is an amenable number.

18312737 is a deficient number, since it is larger than the sum of its proper divisors (1).

18312737 is an equidigital number, since it uses as much as digits as its factorization.

18312737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 18312737 is about 4279.3383834420. The cubic root of 18312737 is about 263.5832161341.

The spelling of 18312737 in words is "eighteen million, three hundred twelve thousand, seven hundred thirty-seven".