18695731 has 2 divisors, whose sum is σ = 18695732. Its totient is φ = 18695730.

The previous prime is 18695723. The next prime is 18695771. The reversal of 18695731 is 13759681.

It is an a-pointer prime, because the next prime (18695771) can be obtained adding 18695731 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18695731 - 2³ = 18695723 is a prime.

It is a super-2 number, since 2×18695731² = 699060715248722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18695771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9347865 + 9347866.

It is an arithmetic number, because the mean of its divisors is an integer number (9347866).

Almost surely, 2^18695731 is an apocalyptic number.

18695731 is a deficient number, since it is larger than the sum of its proper divisors (1).

18695731 is an equidigital number, since it uses as much as digits as its factorization.

18695731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 18695731 is about 4323.8560336810. The cubic root of 18695731 is about 265.4080860914.

The spelling of 18695731 in words is "eighteen million, six hundred ninety-five thousand, seven hundred thirty-one".