491940539 has 8 divisors (see below), whose sum is σ = 501030432. Its totient is φ = 482883840.

The previous prime is 491940529. The next prime is 491940569. The reversal of 491940539 is 935049194.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 491940539 - 2⁴ = 491940523 is a prime.

It is a super-2 number, since 2×491940539² = 484010987823221042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491940539.

It is not an unprimeable number, because it can be changed into a prime (491940529) 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, 22667 + ... + 38699.

It is an arithmetic number, because the mean of its divisors is an integer number (62628804).

Almost surely, 2^491940539 is an apocalyptic number.

491940539 is a deficient number, since it is larger than the sum of its proper divisors (9089893).

491940539 is a wasteful number, since it uses less digits than its factorization.

491940539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16597.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 491940539 is about 22179.7326178653. The cubic root of 491940539 is about 789.4128730549.

The spelling of 491940539 in words is "four hundred ninety-one million, nine hundred forty thousand, five hundred thirty-nine".