491000331 has 4 divisors (see below), whose sum is σ = 654667112. Its totient is φ = 327333552.

The previous prime is 491000311. The next prime is 491000339. The reversal of 491000331 is 133000194.

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

It is not a de Polignac number, because 491000331 - 2⁶ = 491000267 is a prime.

It is a super-2 number, since 2×491000331² = 482162650084219122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491000298 and 491000307.

It is not an unprimeable number, because it can be changed into a prime (491000339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81833386 + ... + 81833391.

It is an arithmetic number, because the mean of its divisors is an integer number (163666778).

Almost surely, 2^491000331 is an apocalyptic number.

491000331 is a deficient number, since it is larger than the sum of its proper divisors (163666781).

491000331 is a wasteful number, since it uses less digits than its factorization.

491000331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163666780.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 491000331 is about 22158.5272750695. The cubic root of 491000331 is about 788.9096376793.

The spelling of 491000331 in words is "four hundred ninety-one million, three hundred thirty-one", and thus it is an aban number.