18313951 has 2 divisors, whose sum is σ = 18313952. Its totient is φ = 18313950.

The previous prime is 18313949. The next prime is 18313961. The reversal of 18313951 is 15931381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18313951 - 2¹ = 18313949 is a prime.

Together with 18313949, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18313961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9156975 + 9156976.

It is an arithmetic number, because the mean of its divisors is an integer number (9156976).

Almost surely, 2^18313951 is an apocalyptic number.

18313951 is a deficient number, since it is larger than the sum of its proper divisors (1).

18313951 is an equidigital number, since it uses as much as digits as its factorization.

18313951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 31.

The square root of 18313951 is about 4279.4802254479. The cubic root of 18313951 is about 263.5890405493.

The spelling of 18313951 in words is "eighteen million, three hundred thirteen thousand, nine hundred fifty-one".