491494097 has 4 divisors (see below), whose sum is σ = 494209716. Its totient is φ = 488778480.

The previous prime is 491494093. The next prime is 491494099. The reversal of 491494097 is 790494194.

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

It can be written as a sum of positive squares in 2 ways, for example, as 59228416 + 432265681 = 7696^2 + 20791^2 .

It is a cyclic number.

It is not a de Polignac number, because 491494097 - 2² = 491494093 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491494093) 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, 1357538 + ... + 1357899.

It is an arithmetic number, because the mean of its divisors is an integer number (123552429).

Almost surely, 2^491494097 is an apocalyptic number.

It is an amenable number.

491494097 is a deficient number, since it is larger than the sum of its proper divisors (2715619).

491494097 is a wasteful number, since it uses less digits than its factorization.

491494097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715618.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 491494097 is about 22169.6661454339. Note that the first 3 decimals coincide. The cubic root of 491494097 is about 789.1740001977.

The spelling of 491494097 in words is "four hundred ninety-one million, four hundred ninety-four thousand, ninety-seven".