18961444331 has 2 divisors, whose sum is σ = 18961444332. Its totient is φ = 18961444330.

The previous prime is 18961444321. The next prime is 18961444339. The reversal of 18961444331 is 13344416981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18961444331 - 2¹⁸ = 18961182187 is a prime.

It is a super-2 number, since 2×18961444331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18961444339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9480722165 + 9480722166.

It is an arithmetic number, because the mean of its divisors is an integer number (9480722166).

Almost surely, 2^18961444331 is an apocalyptic number.

18961444331 is a deficient number, since it is larger than the sum of its proper divisors (1).

18961444331 is an equidigital number, since it uses as much as digits as its factorization.

18961444331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The spelling of 18961444331 in words is "eighteen billion, nine hundred sixty-one million, four hundred forty-four thousand, three hundred thirty-one".