2391885491 has 2 divisors, whose sum is σ = 2391885492. Its totient is φ = 2391885490.

The previous prime is 2391885473. The next prime is 2391885493. The reversal of 2391885491 is 1945881932.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2391885491 is a prime.

It is a super-2 number, since 2×2391885491² = 11442232404112622162, which contains 22 as substring.

Together with 2391885493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2391885493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1195942745 + 1195942746.

It is an arithmetic number, because the mean of its divisors is an integer number (1195942746).

Almost surely, 2^2391885491 is an apocalyptic number.

2391885491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2391885491 is an equidigital number, since it uses as much as digits as its factorization.

2391885491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 50.

The square root of 2391885491 is about 48906.9063732312. The cubic root of 2391885491 is about 1337.3552742463.

The spelling of 2391885491 in words is "two billion, three hundred ninety-one million, eight hundred eighty-five thousand, four hundred ninety-one".