1991262476 has 12 divisors (see below), whose sum is σ = 3982525008. Its totient is φ = 853398192.

The previous prime is 1991262439. The next prime is 1991262499. The reversal of 1991262476 is 6742621991.

1991262476 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1991262476.

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, 35558231 + ... + 35558286.

It is an arithmetic number, because the mean of its divisors is an integer number (331877084).

Almost surely, 2^1991262476 is an apocalyptic number.

It is an amenable number.

1991262476 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1991262476 is a wasteful number, since it uses less digits than its factorization.

1991262476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71116528 (or 71116526 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 1991262476 is about 44623.5641337623. The cubic root of 1991262476 is about 1258.0836064385.

The spelling of 1991262476 in words is "one billion, nine hundred ninety-one million, two hundred sixty-two thousand, four hundred seventy-six".