1991477272 has 16 divisors (see below), whose sum is σ = 3734533800. Its totient is φ = 995601600.

The previous prime is 1991477269. The next prime is 1991477311. The reversal of 1991477272 is 2727741991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71772 + ... + 95572.

Almost surely, 2^1991477272 is an apocalyptic number.

It is an amenable number.

1991477272 is a deficient number, since it is larger than the sum of its proper divisors (1743056528).

1991477272 is a wasteful number, since it uses less digits than its factorization.

1991477272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34266 (or 34262 counting only the distinct ones).

The product of its digits is 444528, while the sum is 49.

The square root of 1991477272 is about 44625.9708241737. The cubic root of 1991477272 is about 1258.1288409925.

The spelling of 1991477272 in words is "one billion, nine hundred ninety-one million, four hundred seventy-seven thousand, two hundred seventy-two".