18491323 has 2 divisors, whose sum is σ = 18491324. Its totient is φ = 18491322.

The previous prime is 18491273. The next prime is 18491339. The reversal of 18491323 is 32319481.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18491323 is a prime.

It is not a weakly prime, because it can be changed into another prime (18491353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9245661 + 9245662.

It is an arithmetic number, because the mean of its divisors is an integer number (9245662).

Almost surely, 2^18491323 is an apocalyptic number.

18491323 is a deficient number, since it is larger than the sum of its proper divisors (1).

18491323 is an equidigital number, since it uses as much as digits as its factorization.

18491323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 18491323 is about 4300.1538344576. The cubic root of 18491323 is about 264.4372679609.

The spelling of 18491323 in words is "eighteen million, four hundred ninety-one thousand, three hundred twenty-three".