18150649 has 4 divisors (see below), whose sum is σ = 19800720. Its totient is φ = 16500580.

The previous prime is 18150637. The next prime is 18150667. The reversal of 18150649 is 94605181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18150649 - 2⁵ = 18150617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18150449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825019 + ... + 825040.

It is an arithmetic number, because the mean of its divisors is an integer number (4950180).

Almost surely, 2^18150649 is an apocalyptic number.

It is an amenable number.

18150649 is a deficient number, since it is larger than the sum of its proper divisors (1650071).

18150649 is a wasteful number, since it uses less digits than its factorization.

18150649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650070.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 18150649 is about 4260.3578488197. The cubic root of 18150649 is about 262.8032426024.

The spelling of 18150649 in words is "eighteen million, one hundred fifty thousand, six hundred forty-nine".