491061243 has 4 divisors (see below), whose sum is σ = 654748328. Its totient is φ = 327374160.

The previous prime is 491061227. The next prime is 491061281. The reversal of 491061243 is 342160194.

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

It is not a de Polignac number, because 491061243 - 2⁴ = 491061227 is a prime.

It is a super-2 number, since 2×491061243² = 482282288753410098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491061243.

It is not an unprimeable number, because it can be changed into a prime (491061203) 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, 81843538 + ... + 81843543.

It is an arithmetic number, because the mean of its divisors is an integer number (163687082).

Almost surely, 2^491061243 is an apocalyptic number.

491061243 is a deficient number, since it is larger than the sum of its proper divisors (163687085).

491061243 is a wasteful number, since it uses less digits than its factorization.

491061243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163687084.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 491061243 is about 22159.9016920202. The cubic root of 491061243 is about 788.9422595697.

The spelling of 491061243 in words is "four hundred ninety-one million, sixty-one thousand, two hundred forty-three".