491023311 has 8 divisors (see below), whose sum is σ = 665794560. Its totient is φ = 321800472.

The previous prime is 491023303. The next prime is 491023333. The reversal of 491023311 is 113320194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491023311 - 2³ = 491023303 is a prime.

It is a super-2 number, since 2×491023311² = 482207783890805442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491023301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1386895 + ... + 1387248.

It is an arithmetic number, because the mean of its divisors is an integer number (83224320).

Almost surely, 2^491023311 is an apocalyptic number.

491023311 is a deficient number, since it is larger than the sum of its proper divisors (174771249).

491023311 is a wasteful number, since it uses less digits than its factorization.

491023311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774205.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 491023311 is about 22159.0458052688. The cubic root of 491023311 is about 788.9219451121.

The spelling of 491023311 in words is "four hundred ninety-one million, twenty-three thousand, three hundred eleven".