18054991 has 2 divisors, whose sum is σ = 18054992. Its totient is φ = 18054990.

The previous prime is 18054983. The next prime is 18055013. The reversal of 18054991 is 19945081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18054991 - 2³ = 18054983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18054991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18054941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9027495 + 9027496.

It is an arithmetic number, because the mean of its divisors is an integer number (9027496).

Almost surely, 2^18054991 is an apocalyptic number.

18054991 is a deficient number, since it is larger than the sum of its proper divisors (1).

18054991 is an equidigital number, since it uses as much as digits as its factorization.

18054991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 18054991 is about 4249.1164964025. The cubic root of 18054991 is about 262.3407517849.

The spelling of 18054991 in words is "eighteen million, fifty-four thousand, nine hundred ninety-one".