491273959 has 4 divisors (see below), whose sum is σ = 535935240. Its totient is φ = 446612680.

The previous prime is 491273947. The next prime is 491273971. The reversal of 491273959 is 959372194.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (491273947) and next prime (491273971).

It is a cyclic number.

It is not a de Polignac number, because 491273959 - 2⁵ = 491273927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491270959) 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 in 3 ways as a sum of consecutive naturals, for example, 22330624 + ... + 22330645.

It is an arithmetic number, because the mean of its divisors is an integer number (133983810).

Almost surely, 2^491273959 is an apocalyptic number.

491273959 is a deficient number, since it is larger than the sum of its proper divisors (44661281).

491273959 is a wasteful number, since it uses less digits than its factorization.

491273959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44661280.

The product of its digits is 612360, while the sum is 49.

The square root of 491273959 is about 22164.7007423967. The cubic root of 491273959 is about 789.0561601051.

The spelling of 491273959 in words is "four hundred ninety-one million, two hundred seventy-three thousand, nine hundred fifty-nine".