491951597 has 2 divisors, whose sum is σ = 491951598. Its totient is φ = 491951596.

The previous prime is 491951567. The next prime is 491951609. The reversal of 491951597 is 795159194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285914281 + 206037316 = 16909^2 + 14354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491951597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491951527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245975798 + 245975799.

It is an arithmetic number, because the mean of its divisors is an integer number (245975799).

Almost surely, 2^491951597 is an apocalyptic number.

It is an amenable number.

491951597 is a deficient number, since it is larger than the sum of its proper divisors (1).

491951597 is an equidigital number, since it uses as much as digits as its factorization.

491951597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 510300, while the sum is 50.

The square root of 491951597 is about 22179.9818980990. The cubic root of 491951597 is about 789.4187879039.

The spelling of 491951597 in words is "four hundred ninety-one million, nine hundred fifty-one thousand, five hundred ninety-seven".