491372983 has 2 divisors, whose sum is σ = 491372984. Its totient is φ = 491372982.

The previous prime is 491372977. The next prime is 491373011. The reversal of 491372983 is 389273194.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491372983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491372953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245686491 + 245686492.

It is an arithmetic number, because the mean of its divisors is an integer number (245686492).

Almost surely, 2^491372983 is an apocalyptic number.

491372983 is a deficient number, since it is larger than the sum of its proper divisors (1).

491372983 is an equidigital number, since it uses as much as digits as its factorization.

491372983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

The square root of 491372983 is about 22166.9344520166. The cubic root of 491372983 is about 789.1091721069.

The spelling of 491372983 in words is "four hundred ninety-one million, three hundred seventy-two thousand, nine hundred eighty-three".