1991774950 has 72 divisors (see below), whose sum is σ = 4098583656. Its totient is φ = 720095200.

The previous prime is 1991774947. The next prime is 1991774971. The reversal of 1991774950 is 594771991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11513064 + ... + 11513236.

It is an arithmetic number, because the mean of its divisors is an integer number (56924773).

Almost surely, 2^1991774950 is an apocalyptic number.

1991774950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1991774950 is an abundant number, since it is smaller than the sum of its proper divisors (2106808706).

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

1991774950 is an equidigital number, since it uses as much as digits as its factorization.

1991774950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 714420, while the sum is 52.

The square root of 1991774950 is about 44629.3059547199. The cubic root of 1991774950 is about 1258.1915245463.

The spelling of 1991774950 in words is "one billion, nine hundred ninety-one million, seven hundred seventy-four thousand, nine hundred fifty".