909491018231 has 2 divisors, whose sum is σ = 909491018232. Its totient is φ = 909491018230.

The previous prime is 909491018141. The next prime is 909491018269. The reversal of 909491018231 is 132810194909.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 909491018231 - 2³⁴ = 892311149047 is a prime.

It is a super-2 number, since 2×909491018231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (909491018281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454745509115 + 454745509116.

It is an arithmetic number, because the mean of its divisors is an integer number (454745509116).

Almost surely, 2^909491018231 is an apocalyptic number.

909491018231 is a deficient number, since it is larger than the sum of its proper divisors (1).

909491018231 is an equidigital number, since it uses as much as digits as its factorization.

909491018231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 47.

The spelling of 909491018231 in words is "nine hundred nine billion, four hundred ninety-one million, eighteen thousand, two hundred thirty-one".