18618371 has 2 divisors, whose sum is σ = 18618372. Its totient is φ = 18618370.

The previous prime is 18618367. The next prime is 18618373. The reversal of 18618371 is 17381681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18618371 - 2² = 18618367 is a prime.

Together with 18618373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18618373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9309185 + 9309186.

It is an arithmetic number, because the mean of its divisors is an integer number (9309186).

Almost surely, 2^18618371 is an apocalyptic number.

18618371 is a deficient number, since it is larger than the sum of its proper divisors (1).

18618371 is an equidigital number, since it uses as much as digits as its factorization.

18618371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The square root of 18618371 is about 4314.9010417390. The cubic root of 18618371 is about 265.0415076788.

The spelling of 18618371 in words is "eighteen million, six hundred eighteen thousand, three hundred seventy-one".