18489131 has 2 divisors, whose sum is σ = 18489132. Its totient is φ = 18489130.

The previous prime is 18489101. The next prime is 18489139. The reversal of 18489131 is 13198481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18489131 - 2¹⁸ = 18226987 is a prime.

It is a super-2 number, since 2×18489131² = 683695930270322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18489091 and 18489100.

It is not a weakly prime, because it can be changed into another prime (18489139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9244565 + 9244566.

It is an arithmetic number, because the mean of its divisors is an integer number (9244566).

Almost surely, 2^18489131 is an apocalyptic number.

18489131 is a deficient number, since it is larger than the sum of its proper divisors (1).

18489131 is an equidigital number, since it uses as much as digits as its factorization.

18489131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 35.

The square root of 18489131 is about 4299.8989523011. The cubic root of 18489131 is about 264.4268185662.

The spelling of 18489131 in words is "eighteen million, four hundred eighty-nine thousand, one hundred thirty-one".