18814585091 has 2 divisors, whose sum is σ = 18814585092. Its totient is φ = 18814585090.

The previous prime is 18814585057. The next prime is 18814585109. The reversal of 18814585091 is 19058541881.

Together with next prime (18814585109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (19058541881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18814585091 is a prime.

It is a super-2 number, since 2×18814585091² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18814585021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9407292545 + 9407292546.

It is an arithmetic number, because the mean of its divisors is an integer number (9407292546).

Almost surely, 2^18814585091 is an apocalyptic number.

18814585091 is a deficient number, since it is larger than the sum of its proper divisors (1).

18814585091 is an equidigital number, since it uses as much as digits as its factorization.

18814585091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 50.

The spelling of 18814585091 in words is "eighteen billion, eight hundred fourteen million, five hundred eighty-five thousand, ninety-one".