491157 has 8 divisors (see below), whose sum is σ = 727680. Its totient is φ = 327420.

The previous prime is 491149. The next prime is 491159. The reversal of 491157 is 751194.

It is not a de Polignac number, because 491157 - 2³ = 491149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 18191 = 491157 / (4 + 9 + 1 + 1 + 5 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 491157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491159) 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 in 7 ways as a sum of consecutive naturals, for example, 9069 + ... + 9122.

It is an arithmetic number, because the mean of its divisors is an integer number (90960).

2⁴⁹¹¹⁵⁷ is an apocalyptic number.

It is an amenable number.

491157 is a deficient number, since it is larger than the sum of its proper divisors (236523).

491157 is a wasteful number, since it uses less digits than its factorization.

491157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18200 (or 18194 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 491157 is about 700.8259413007. The cubic root of 491157 is about 78.8993537514.

The spelling of 491157 in words is "four hundred ninety-one thousand, one hundred fifty-seven".