18694031 has 2 divisors, whose sum is σ = 18694032. Its totient is φ = 18694030.

The previous prime is 18693979. The next prime is 18694051. The reversal of 18694031 is 13049681.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18694031 is a prime.

It is a super-2 number, since 2×18694031² = 698933590057922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18694051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9347015 + 9347016.

It is an arithmetic number, because the mean of its divisors is an integer number (9347016).

Almost surely, 2^18694031 is an apocalyptic number.

18694031 is a deficient number, since it is larger than the sum of its proper divisors (1).

18694031 is an equidigital number, since it uses as much as digits as its factorization.

18694031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18694031 is about 4323.6594454235. The cubic root of 18694031 is about 265.4000413418.

The spelling of 18694031 in words is "eighteen million, six hundred ninety-four thousand, thirty-one".