491956091 has 4 divisors (see below), whose sum is σ = 536679384. Its totient is φ = 447232800.

The previous prime is 491956067. The next prime is 491956099. The reversal of 491956091 is 190659194.

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 491956091 - 2⁶ = 491956027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491956099) 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, 22361630 + ... + 22361651.

It is an arithmetic number, because the mean of its divisors is an integer number (134169846).

Almost surely, 2^491956091 is an apocalyptic number.

491956091 is a deficient number, since it is larger than the sum of its proper divisors (44723293).

491956091 is a wasteful number, since it uses less digits than its factorization.

491956091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44723292.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 491956091 is about 22180.0832054346. The cubic root of 491956091 is about 789.4211916887.

The spelling of 491956091 in words is "four hundred ninety-one million, nine hundred fifty-six thousand, ninety-one".