1091937906 has 24 divisors (see below), whose sum is σ = 2410506540. Its totient is φ = 357111456.

The previous prime is 1091937877. The next prime is 1091937929. The reversal of 1091937906 is 6097391901.

It can be written as a sum of positive squares in 2 ways, for example, as 1010667681 + 81270225 = 31791^2 + 9015^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 571341 + ... + 573248.

Almost surely, 2^1091937906 is an apocalyptic number.

1091937906 is an abundant number, since it is smaller than the sum of its proper divisors (1318568634).

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

1091937906 is a wasteful number, since it uses less digits than its factorization.

1091937906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144650 (or 1144647 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 45.

The square root of 1091937906 is about 33044.4837453999. The cubic root of 1091937906 is about 1029.7520080373.

The spelling of 1091937906 in words is "one billion, ninety-one million, nine hundred thirty-seven thousand, nine hundred six".