491373642 has 16 divisors (see below), whose sum is σ = 1005602400. Its totient is φ = 159982032.

The previous prime is 491373581. The next prime is 491373647. The reversal of 491373642 is 246373194.

It is a self number, because there is not a number n which added to its sum of digits gives 491373642.

It is not an unprimeable number, because it can be changed into a prime (491373647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 952017 + ... + 952532.

It is an arithmetic number, because the mean of its divisors is an integer number (62850150).

Almost surely, 2^491373642 is an apocalyptic number.

491373642 is an abundant number, since it is smaller than the sum of its proper divisors (514228758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491373642 is a wasteful number, since it uses less digits than its factorization.

491373642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904597.

The product of its digits is 108864, while the sum is 39.

The square root of 491373642 is about 22166.9493164937. The cubic root of 491373642 is about 789.1095248754.

The spelling of 491373642 in words is "four hundred ninety-one million, three hundred seventy-three thousand, six hundred forty-two".