1991295360 has 128 divisors (see below), whose sum is σ = 7052565600. Its totient is φ = 531007488.

The previous prime is 1991295349. The next prime is 1991295373. The reversal of 1991295360 is 635921991.

It is a happy number.

1991295360 is a `hidden beast` number, since 1 + 9 + 91 + 29 + 536 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 40339 + ... + 74898.

Almost surely, 2^1991295360 is an apocalyptic number.

1991295360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1991295360 is an abundant number, since it is smaller than the sum of its proper divisors (5061270240).

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

1991295360 is a wasteful number, since it uses less digits than its factorization.

1991295360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115265 (or 115247 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 1991295360 is about 44623.9325922761. The cubic root of 1991295360 is about 1258.0905317926.

The spelling of 1991295360 in words is "one billion, nine hundred ninety-one million, two hundred ninety-five thousand, three hundred sixty".