491729439 has 4 divisors (see below), whose sum is σ = 655639256. Its totient is φ = 327819624.

The previous prime is 491729431. The next prime is 491729461. The reversal of 491729439 is 934927194.

It is a happy number.

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

It is not a de Polignac number, because 491729439 - 2³ = 491729431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491729431) 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 3 ways as a sum of consecutive naturals, for example, 81954904 + ... + 81954909.

It is an arithmetic number, because the mean of its divisors is an integer number (163909814).

Almost surely, 2^491729439 is an apocalyptic number.

491729439 is a deficient number, since it is larger than the sum of its proper divisors (163909817).

491729439 is a wasteful number, since it uses less digits than its factorization.

491729439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163909816.

The product of its digits is 489888, while the sum is 48.

The square root of 491729439 is about 22174.9732581575. The cubic root of 491729439 is about 789.2999400974.

The spelling of 491729439 in words is "four hundred ninety-one million, seven hundred twenty-nine thousand, four hundred thirty-nine".