491242897 has 4 divisors (see below), whose sum is σ = 520139556. Its totient is φ = 462346240.

The previous prime is 491242883. The next prime is 491242933. The reversal of 491242897 is 798242194.

It is a Cunningham number, because it is equal to 22164²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798242194 = 2 ⋅399121097.

It can be written as a sum of positive squares in 2 ways, for example, as 382437136 + 108805761 = 19556^2 + 10431^2 .

It is a cyclic number.

It is not a de Polignac number, because 491242897 - 2²⁷ = 357025169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491242877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14448304 + ... + 14448337.

It is an arithmetic number, because the mean of its divisors is an integer number (130034889).

Almost surely, 2^491242897 is an apocalyptic number.

It is an amenable number.

491242897 is a deficient number, since it is larger than the sum of its proper divisors (28896659).

491242897 is a wasteful number, since it uses less digits than its factorization.

491242897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28896658.

The product of its digits is 290304, while the sum is 46.

The square root of 491242897 is about 22164.0000225591. Note that the first 4 decimals coincide. The cubic root of 491242897 is about 789.0395297515.

The spelling of 491242897 in words is "four hundred ninety-one million, two hundred forty-two thousand, eight hundred ninety-seven".