1091647992 has 64 divisors (see below), whose sum is σ = 2755658880. Its totient is φ = 360363392.

The previous prime is 1091647961. The next prime is 1091647993. The reversal of 1091647992 is 2997461901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091647993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1938703 + ... + 1939265.

It is an arithmetic number, because the mean of its divisors is an integer number (43057170).

Almost surely, 2^1091647992 is an apocalyptic number.

1091647992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1091647992 is an abundant number, since it is smaller than the sum of its proper divisors (1664010888).

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

1091647992 is a wasteful number, since it uses less digits than its factorization.

1091647992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212 (or 1208 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 1091647992 is about 33040.0967310933. The cubic root of 1091647992 is about 1029.6608655077.

The spelling of 1091647992 in words is "one billion, ninety-one million, six hundred forty-seven thousand, nine hundred ninety-two".