18290936491 has 4 divisors (see below), whose sum is σ = 18295551232. Its totient is φ = 18286321752.

The previous prime is 18290936423. The next prime is 18290936519. The reversal of 18290936491 is 19463909281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19463909281 = 7759 ⋅2508559.

It is a cyclic number.

It is not a de Polignac number, because 18290936491 - 2¹¹ = 18290934443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18290936401) 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, 2301420 + ... + 2309353.

It is an arithmetic number, because the mean of its divisors is an integer number (4573887808).

Almost surely, 2^18290936491 is an apocalyptic number.

18290936491 is a deficient number, since it is larger than the sum of its proper divisors (4614741).

18290936491 is an equidigital number, since it uses as much as digits as its factorization.

18290936491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4614740.

The product of its (nonzero) digits is 839808, while the sum is 52.

The spelling of 18290936491 in words is "eighteen billion, two hundred ninety million, nine hundred thirty-six thousand, four hundred ninety-one".