1991751360 has 112 divisors (see below), whose sum is σ = 6337499136. Its totient is φ = 529984512.

The previous prime is 1991751319. The next prime is 1991751371. The reversal of 1991751360 is 631571991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 500097 + ... + 504063.

Almost surely, 2^1991751360 is an apocalyptic number.

1991751360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1991751360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3168749568).

1991751360 is an abundant number, since it is smaller than the sum of its proper divisors (4345747776).

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

1991751360 is a wasteful number, since it uses less digits than its factorization.

1991751360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510 (or 4500 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 1991751360 is about 44629.0416657136. The cubic root of 1991751360 is about 1258.1865573092.

The spelling of 1991751360 in words is "one billion, nine hundred ninety-one million, seven hundred fifty-one thousand, three hundred sixty".