18159139 has 2 divisors, whose sum is σ = 18159140. Its totient is φ = 18159138.

The previous prime is 18159131. The next prime is 18159143. The reversal of 18159139 is 93195181.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18159139 - 2³ = 18159131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18159098 and 18159107.

It is not a weakly prime, because it can be changed into another prime (18159131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9079569 + 9079570.

It is an arithmetic number, because the mean of its divisors is an integer number (9079570).

Almost surely, 2^18159139 is an apocalyptic number.

18159139 is a deficient number, since it is larger than the sum of its proper divisors (1).

18159139 is an equidigital number, since it uses as much as digits as its factorization.

18159139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 37.

The square root of 18159139 is about 4261.3541275045. The cubic root of 18159139 is about 262.8442117845.

The spelling of 18159139 in words is "eighteen million, one hundred fifty-nine thousand, one hundred thirty-nine".