491634463 has 2 divisors, whose sum is σ = 491634464. Its totient is φ = 491634462.

The previous prime is 491634461. The next prime is 491634467. The reversal of 491634463 is 364436194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491634463 - 2¹ = 491634461 is a prime.

Together with 491634461, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491634461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245817231 + 245817232.

It is an arithmetic number, because the mean of its divisors is an integer number (245817232).

Almost surely, 2^491634463 is an apocalyptic number.

491634463 is a deficient number, since it is larger than the sum of its proper divisors (1).

491634463 is an equidigital number, since it uses as much as digits as its factorization.

491634463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 40.

The square root of 491634463 is about 22172.8316414481. The cubic root of 491634463 is about 789.2491198888.

The spelling of 491634463 in words is "four hundred ninety-one million, six hundred thirty-four thousand, four hundred sixty-three".