18477091 has 2 divisors, whose sum is σ = 18477092. Its totient is φ = 18477090.

The previous prime is 18477077. The next prime is 18477127. The reversal of 18477091 is 19077481.

It is a weak prime.

It is an emirp because it is prime and its reverse (19077481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18477091 - 2⁷ = 18476963 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18477091.

It is not a weakly prime, because it can be changed into another prime (18477061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9238545 + 9238546.

It is an arithmetic number, because the mean of its divisors is an integer number (9238546).

Almost surely, 2^18477091 is an apocalyptic number.

18477091 is a deficient number, since it is larger than the sum of its proper divisors (1).

18477091 is an equidigital number, since it uses as much as digits as its factorization.

18477091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 18477091 is about 4298.4986914038. The cubic root of 18477091 is about 264.3694084367.

The spelling of 18477091 in words is "eighteen million, four hundred seventy-seven thousand, ninety-one".