491565194 has 4 divisors (see below), whose sum is σ = 737347794. Its totient is φ = 245782596.

The previous prime is 491565181. The next prime is 491565197.

491565194 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in only one way, i.e., 283484569 + 208080625 = 16837^2 + 14425^2 .

It is not an unprimeable number, because it can be changed into a prime (491565197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122891297 + ... + 122891300.

Almost surely, 2^491565194 is an apocalyptic number.

491565194 is a deficient number, since it is larger than the sum of its proper divisors (245782600).

491565194 is a wasteful number, since it uses less digits than its factorization.

491565194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245782599.

The product of its digits is 194400, while the sum is 44.

The square root of 491565194 is about 22171.2695622059. The cubic root of 491565194 is about 789.2120509760.

The spelling of 491565194 in words is "four hundred ninety-one million, five hundred sixty-five thousand, one hundred ninety-four".