491640799 has 32 divisors (see below), whose sum is σ = 594397440. Its totient is φ = 402124800.

The previous prime is 491640797. The next prime is 491640817. The reversal of 491640799 is 997046194.

It is not a de Polignac number, because 491640799 - 2¹ = 491640797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491640791) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261834 + ... + 263704.

It is an arithmetic number, because the mean of its divisors is an integer number (18574920).

Almost surely, 2^491640799 is an apocalyptic number.

491640799 is a deficient number, since it is larger than the sum of its proper divisors (102756641).

491640799 is a wasteful number, since it uses less digits than its factorization.

491640799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1971.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 491640799 is about 22172.9745185440. The cubic root of 491640799 is about 789.2525103894.

The spelling of 491640799 in words is "four hundred ninety-one million, six hundred forty thousand, seven hundred ninety-nine".