1091347992 has 384 divisors, whose sum is σ = 3813984000. Its totient is φ = 290993472.

The previous prime is 1091347969. The next prime is 1091348009. The reversal of 1091347992 is 2997431901.

1091347992 is a `hidden beast` number, since 1 + 0 + 91 + 3 + 479 + 92 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16288743 + ... + 16288809.

It is an arithmetic number, because the mean of its divisors is an integer number (9932250).

Almost surely, 2^1091347992 is an apocalyptic number.

1091347992 is a gapful number since it is divisible by the number (12) 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 1091347992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1906992000).

1091347992 is an abundant number, since it is smaller than the sum of its proper divisors (2722636008).

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

1091347992 is an equidigital number, since it uses as much as digits as its factorization.

1091347992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 1091347992 is about 33035.5564808586. The cubic root of 1091347992 is about 1029.5665351733.

1091347992 divided by its product of nonzero digits (122472) gives a triangular number (8911 = T₁₃₃).

The spelling of 1091347992 in words is "one billion, ninety-one million, three hundred forty-seven thousand, nine hundred ninety-two".