491239965 has 32 divisors (see below), whose sum is σ = 828950400. Its totient is φ = 247726080.

The previous prime is 491239951. The next prime is 491239979. The reversal of 491239965 is 569932194.

491239965 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (491239951) and next prime (491239979).

It is not a de Polignac number, because 491239965 - 2⁴ = 491239949 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 181341 + ... + 184029.

It is an arithmetic number, because the mean of its divisors is an integer number (25904700).

Almost surely, 2^491239965 is an apocalyptic number.

It is an amenable number.

491239965 is a deficient number, since it is larger than the sum of its proper divisors (337710435).

491239965 is a wasteful number, since it uses less digits than its factorization.

491239965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357.

The product of its digits is 524880, while the sum is 48.

The square root of 491239965 is about 22163.9338791650. The cubic root of 491239965 is about 789.0379599452.

The spelling of 491239965 in words is "four hundred ninety-one million, two hundred thirty-nine thousand, nine hundred sixty-five".