1091993788 has 6 divisors (see below), whose sum is σ = 1910989136. Its totient is φ = 545996892.

The previous prime is 1091993779. The next prime is 1091993831. The reversal of 1091993788 is 8873991901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136499220 + ... + 136499227.

Almost surely, 2^1091993788 is an apocalyptic number.

It is an amenable number.

1091993788 is a deficient number, since it is larger than the sum of its proper divisors (818995348).

1091993788 is a wasteful number, since it uses less digits than its factorization.

1091993788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272998451 (or 272998449 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 55.

The square root of 1091993788 is about 33045.3292917471. The cubic root of 1091993788 is about 1029.7695742437.

The spelling of 1091993788 in words is "one billion, ninety-one million, nine hundred ninety-three thousand, seven hundred eighty-eight".