495421891 has 2 divisors, whose sum is σ = 495421892. Its totient is φ = 495421890.

The previous prime is 495421889. The next prime is 495421921. The reversal of 495421891 is 198124594.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 495421891 - 2¹ = 495421889 is a prime.

Together with 495421889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (495421831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247710945 + 247710946.

It is an arithmetic number, because the mean of its divisors is an integer number (247710946).

Almost surely, 2^495421891 is an apocalyptic number.

495421891 is a deficient number, since it is larger than the sum of its proper divisors (1).

495421891 is an equidigital number, since it uses as much as digits as its factorization.

495421891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The square root of 495421891 is about 22258.0747370477. The cubic root of 495421891 is about 791.2706630257.

The spelling of 495421891 in words is "four hundred ninety-five million, four hundred twenty-one thousand, eight hundred ninety-one".