18740531 has 2 divisors, whose sum is σ = 18740532. Its totient is φ = 18740530.

The previous prime is 18740489. The next prime is 18740539. The reversal of 18740531 is 13504781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18740531 - 2¹⁰ = 18739507 is a prime.

It is a super-2 number, since 2×18740531² = 702415004323922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 18740494 and 18740503.

It is not a weakly prime, because it can be changed into another prime (18740539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9370265 + 9370266.

It is an arithmetic number, because the mean of its divisors is an integer number (9370266).

Almost surely, 2^18740531 is an apocalyptic number.

18740531 is a deficient number, since it is larger than the sum of its proper divisors (1).

18740531 is an equidigital number, since it uses as much as digits as its factorization.

18740531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 18740531 is about 4329.0334949039. The cubic root of 18740531 is about 265.6199133697.

The spelling of 18740531 in words is "eighteen million, seven hundred forty thousand, five hundred thirty-one".