18494831 has 2 divisors, whose sum is σ = 18494832. Its totient is φ = 18494830.

The previous prime is 18494803. The next prime is 18494851. The reversal of 18494831 is 13849481.

It is a strong prime.

It is an emirp because it is prime and its reverse (13849481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18494831 - 2⁶ = 18494767 is a prime.

It is a super-2 number, since 2×18494831² = 684117547437122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18494851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9247415 + 9247416.

It is an arithmetic number, because the mean of its divisors is an integer number (9247416).

Almost surely, 2^18494831 is an apocalyptic number.

18494831 is a deficient number, since it is larger than the sum of its proper divisors (1).

18494831 is an equidigital number, since it uses as much as digits as its factorization.

18494831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 18494831 is about 4300.5617074982. The cubic root of 18494831 is about 264.4539890879.

The spelling of 18494831 in words is "eighteen million, four hundred ninety-four thousand, eight hundred thirty-one".