18182531 has 2 divisors, whose sum is σ = 18182532. Its totient is φ = 18182530.

The previous prime is 18182497. The next prime is 18182533. The reversal of 18182531 is 13528181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18182531 - 2¹⁰ = 18181507 is a prime.

It is a super-2 number, since 2×18182531² = 661208867131922, which contains 22 as substring.

Together with 18182533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18182494 and 18182503.

It is not a weakly prime, because it can be changed into another prime (18182533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9091265 + 9091266.

It is an arithmetic number, because the mean of its divisors is an integer number (9091266).

Almost surely, 2^18182531 is an apocalyptic number.

18182531 is a deficient number, since it is larger than the sum of its proper divisors (1).

18182531 is an equidigital number, since it uses as much as digits as its factorization.

18182531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 29.

The square root of 18182531 is about 4264.0979116338. The cubic root of 18182531 is about 262.9570257532.

The spelling of 18182531 in words is "eighteen million, one hundred eighty-two thousand, five hundred thirty-one".