1991095488 has 84 divisors (see below), whose sum is σ = 6042858120. Its totient is φ = 624654336.

The previous prime is 1991095433. The next prime is 1991095489. The reversal of 1991095488 is 8845901991.

1991095488 is a `hidden beast` number, since 1 + 9 + 91 + 0 + 9 + 548 + 8 = 666.

1991095488 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1991095488² = 7928922484667916288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1991095489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91878 + ... + 111461.

Almost surely, 2^1991095488 is an apocalyptic number.

1991095488 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1991095488 is an abundant number, since it is smaller than the sum of its proper divisors (4051762632).

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

1991095488 is a wasteful number, since it uses less digits than its factorization.

1991095488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203374 (or 203361 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The square root of 1991095488 is about 44621.6930203236. The cubic root of 1991095488 is about 1258.0484376715.

The spelling of 1991095488 in words is "one billion, nine hundred ninety-one million, ninety-five thousand, four hundred eighty-eight".