18641291 has 4 divisors (see below), whose sum is σ = 18738072. Its totient is φ = 18544512.

The previous prime is 18641251. The next prime is 18641297. The reversal of 18641291 is 19214681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18641291 - 2¹⁸ = 18379147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18641297) 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, 48101 + ... + 48486.

It is an arithmetic number, because the mean of its divisors is an integer number (4684518).

Almost surely, 2^18641291 is an apocalyptic number.

18641291 is a deficient number, since it is larger than the sum of its proper divisors (96781).

18641291 is an equidigital number, since it uses as much as digits as its factorization.

18641291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96780.

The product of its digits is 3456, while the sum is 32.

The square root of 18641291 is about 4317.5561374463. The cubic root of 18641291 is about 265.1502221720.

The spelling of 18641291 in words is "eighteen million, six hundred forty-one thousand, two hundred ninety-one".