1491673892 has 18 divisors (see below), whose sum is σ = 2643935238. Its totient is φ = 736383648.

The previous prime is 1491673889. The next prime is 1491673919. The reversal of 1491673892 is 2983761941.

It can be written as a sum of positive squares in only one way, i.e., 1343662336 + 148011556 = 36656^2 + 12166^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1491673892.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4913 + ... + 54840.

It is an arithmetic number, because the mean of its divisors is an integer number (146885291).

Almost surely, 2^1491673892 is an apocalyptic number.

It is an amenable number.

1491673892 is a deficient number, since it is larger than the sum of its proper divisors (1152261346).

1491673892 is an equidigital number, since it uses as much as digits as its factorization.

1491673892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59915 (or 59834 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The square root of 1491673892 is about 38622.1942929192. The cubic root of 1491673892 is about 1142.5923083935.

The spelling of 1491673892 in words is "one billion, four hundred ninety-one million, six hundred seventy-three thousand, eight hundred ninety-two".