491111583 has 4 divisors (see below), whose sum is σ = 654815448. Its totient is φ = 327407720.

The previous prime is 491111567. The next prime is 491111587. The reversal of 491111583 is 385111194.

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

It is a cyclic number.

It is not a de Polignac number, because 491111583 - 2⁴ = 491111567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491111587) 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, 81851928 + ... + 81851933.

It is an arithmetic number, because the mean of its divisors is an integer number (163703862).

Almost surely, 2^491111583 is an apocalyptic number.

491111583 is a deficient number, since it is larger than the sum of its proper divisors (163703865).

491111583 is a wasteful number, since it uses less digits than its factorization.

491111583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163703864.

The product of its digits is 4320, while the sum is 33.

The square root of 491111583 is about 22161.0374982761. The cubic root of 491111583 is about 788.9692175081.

The spelling of 491111583 in words is "four hundred ninety-one million, one hundred eleven thousand, five hundred eighty-three".