18375131 has 2 divisors, whose sum is σ = 18375132. Its totient is φ = 18375130.

The previous prime is 18375107. The next prime is 18375151. The reversal of 18375131 is 13157381.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18375131 is a prime.

It is a super-2 number, since 2×18375131² = 675290878534322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18375094 and 18375103.

It is not a weakly prime, because it can be changed into another prime (18375101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9187565 + 9187566.

It is an arithmetic number, because the mean of its divisors is an integer number (9187566).

Almost surely, 2^18375131 is an apocalyptic number.

18375131 is a deficient number, since it is larger than the sum of its proper divisors (1).

18375131 is an equidigital number, since it uses as much as digits as its factorization.

18375131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 18375131 is about 4286.6223299936. The cubic root of 18375131 is about 263.8822314865.

The spelling of 18375131 in words is "eighteen million, three hundred seventy-five thousand, one hundred thirty-one".