18936312294391 has 2 divisors, whose sum is σ = 18936312294392. Its totient is φ = 18936312294390.

The previous prime is 18936312294373. The next prime is 18936312294397. The reversal of 18936312294391 is 19349221363981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18936312294391 - 2⁹ = 18936312293879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18936312294397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9468156147195 + 9468156147196.

It is an arithmetic number, because the mean of its divisors is an integer number (9468156147196).

Almost surely, 2^{18936312294391} is an apocalyptic number.

18936312294391 is a deficient number, since it is larger than the sum of its proper divisors (1).

18936312294391 is an equidigital number, since it uses as much as digits as its factorization.

18936312294391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15116544, while the sum is 61.

The spelling of 18936312294391 in words is "eighteen trillion, nine hundred thirty-six billion, three hundred twelve million, two hundred ninety-four thousand, three hundred ninety-one".