1091978846 has 16 divisors (see below), whose sum is σ = 1877990400. Its totient is φ = 466484280.

The previous prime is 1091978837. The next prime is 1091978861. The reversal of 1091978846 is 6488791901.

It is a super-2 number, since 2×1091978846² = 2384835600222983432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 121046 + ... + 129753.

It is an arithmetic number, because the mean of its divisors is an integer number (117374400).

Almost surely, 2^1091978846 is an apocalyptic number.

1091978846 is a deficient number, since it is larger than the sum of its proper divisors (786011554).

1091978846 is a wasteful number, since it uses less digits than its factorization.

1091978846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251119.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 1091978846 is about 33045.1032075858. The cubic root of 1091978846 is about 1029.7648773650.

The spelling of 1091978846 in words is "one billion, ninety-one million, nine hundred seventy-eight thousand, eight hundred forty-six".