18501641 has 8 divisors (see below), whose sum is σ = 18735360. Its totient is φ = 18269712.

The previous prime is 18501629. The next prime is 18501647. The reversal of 18501641 is 14610581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18501641 - 2¹⁸ = 18239497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18501641.

It is not an unprimeable number, because it can be changed into a prime (18501647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36095 + ... + 36603.

It is an arithmetic number, because the mean of its divisors is an integer number (2341920).

Almost surely, 2^18501641 is an apocalyptic number.

It is an amenable number.

18501641 is a deficient number, since it is larger than the sum of its proper divisors (233719).

18501641 is a wasteful number, since it uses less digits than its factorization.

18501641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 18501641 is about 4301.3533916664. The cubic root of 18501641 is about 264.4864433931.

The spelling of 18501641 in words is "eighteen million, five hundred one thousand, six hundred forty-one".