18853931 has 2 divisors, whose sum is σ = 18853932. Its totient is φ = 18853930.

The previous prime is 18853883. The next prime is 18853943. The reversal of 18853931 is 13935881.

It is a strong prime.

It is an emirp because it is prime and its reverse (13935881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18853931 is a prime.

It is a super-2 number, since 2×18853931² = 710941428305522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18853631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9426965 + 9426966.

It is an arithmetic number, because the mean of its divisors is an integer number (9426966).

Almost surely, 2^18853931 is an apocalyptic number.

18853931 is a deficient number, since it is larger than the sum of its proper divisors (1).

18853931 is an equidigital number, since it uses as much as digits as its factorization.

18853931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 18853931 is about 4342.1113527868. Note that the first 3 decimals coincide. The cubic root of 18853931 is about 266.1545966608.

The spelling of 18853931 in words is "eighteen million, eight hundred fifty-three thousand, nine hundred thirty-one".