18159749 has 2 divisors, whose sum is σ = 18159750. Its totient is φ = 18159748.

The previous prime is 18159737. The next prime is 18159751. The reversal of 18159749 is 94795181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11682724 + 6477025 = 3418^2 + 2545^2 .

It is a cyclic number.

It is not a de Polignac number, because 18159749 - 2²⁴ = 1382533 is a prime.

Together with 18159751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18159709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9079874 + 9079875.

It is an arithmetic number, because the mean of its divisors is an integer number (9079875).

Almost surely, 2^18159749 is an apocalyptic number.

It is an amenable number.

18159749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18159749 is an equidigital number, since it uses as much as digits as its factorization.

18159749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 44.

The square root of 18159749 is about 4261.4257003965. The cubic root of 18159749 is about 262.8471548972.

The spelling of 18159749 in words is "eighteen million, one hundred fifty-nine thousand, seven hundred forty-nine".