1491973144 has 32 divisors (see below), whose sum is σ = 2840904000. Its totient is φ = 734452992.

The previous prime is 1491973141. The next prime is 1491973169. The reversal of 1491973144 is 4413791941.

It is a self number, because there is not a number n which added to its sum of digits gives 1491973144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491973141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232572 + ... + 238900.

It is an arithmetic number, because the mean of its divisors is an integer number (88778250).

Almost surely, 2^1491973144 is an apocalyptic number.

It is an amenable number.

1491973144 is a deficient number, since it is larger than the sum of its proper divisors (1348930856).

1491973144 is a wasteful number, since it uses less digits than its factorization.

1491973144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6787 (or 6783 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 1491973144 is about 38626.0681923491. The cubic root of 1491973144 is about 1142.6687102963.

The spelling of 1491973144 in words is "one billion, four hundred ninety-one million, nine hundred seventy-three thousand, one hundred forty-four".