909090491 has 2 divisors, whose sum is σ = 909090492. Its totient is φ = 909090490.

The previous prime is 909090443. The next prime is 909090527. The reversal of 909090491 is 194090909.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-909090491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (909090401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454545245 + 454545246.

It is an arithmetic number, because the mean of its divisors is an integer number (454545246).

Almost surely, 2^909090491 is an apocalyptic number.

909090491 is a deficient number, since it is larger than the sum of its proper divisors (1).

909090491 is an equidigital number, since it uses as much as digits as its factorization.

909090491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 909090491 is about 30151.1275245222. The cubic root of 909090491 is about 968.7291576452.

The spelling of 909090491 in words is "nine hundred nine million, ninety thousand, four hundred ninety-one".