491357051 has 4 divisors (see below), whose sum is σ = 491421672. Its totient is φ = 491292432.

The previous prime is 491357047. The next prime is 491357107. The reversal of 491357051 is 150753194.

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 491357051 - 2² = 491357047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491357351) 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, 19106 + ... + 36711.

It is an arithmetic number, because the mean of its divisors is an integer number (122855418).

Almost surely, 2^491357051 is an apocalyptic number.

491357051 is a deficient number, since it is larger than the sum of its proper divisors (64621).

491357051 is an equidigital number, since it uses as much as digits as its factorization.

491357051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64620.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 491357051 is about 22166.5750850238. The cubic root of 491357051 is about 789.1006434714.

The spelling of 491357051 in words is "four hundred ninety-one million, three hundred fifty-seven thousand, fifty-one".