491654939 has 2 divisors, whose sum is σ = 491654940. Its totient is φ = 491654938.

The previous prime is 491654897. The next prime is 491654941. The reversal of 491654939 is 939456194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491654939 is a prime.

It is a Sophie Germain prime.

Together with 491654941, 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 (491654959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245827469 + 245827470.

It is an arithmetic number, because the mean of its divisors is an integer number (245827470).

Almost surely, 2^491654939 is an apocalyptic number.

491654939 is a deficient number, since it is larger than the sum of its proper divisors (1).

491654939 is an equidigital number, since it uses as much as digits as its factorization.

491654939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 50.

The square root of 491654939 is about 22173.2933728844. The cubic root of 491654939 is about 789.2600768374.

The spelling of 491654939 in words is "four hundred ninety-one million, six hundred fifty-four thousand, nine hundred thirty-nine".