491974559 has 2 divisors, whose sum is σ = 491974560. Its totient is φ = 491974558.

The previous prime is 491974537. The next prime is 491974573. The reversal of 491974559 is 955479194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491974559 - 2⁸ = 491974303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491974559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491974529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245987279 + 245987280.

It is an arithmetic number, because the mean of its divisors is an integer number (245987280).

Almost surely, 2^491974559 is an apocalyptic number.

491974559 is a deficient number, since it is larger than the sum of its proper divisors (1).

491974559 is an equidigital number, since it uses as much as digits as its factorization.

491974559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 53.

The square root of 491974559 is about 22180.4995209756. The cubic root of 491974559 is about 789.4310698387.

The spelling of 491974559 in words is "four hundred ninety-one million, nine hundred seventy-four thousand, five hundred fifty-nine".