1091939636 has 12 divisors (see below), whose sum is σ = 1912099140. Its totient is φ = 545625600.

The previous prime is 1091939623. The next prime is 1091939647. The reversal of 1091939636 is 6369391901.

It can be written as a sum of positive squares in 2 ways, for example, as 1027843600 + 64096036 = 32060^2 + 8006^2 .

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 3 ways as a sum of consecutive naturals, for example, 78851 + ... + 91658.

It is an arithmetic number, because the mean of its divisors is an integer number (159341595).

Almost surely, 2^1091939636 is an apocalyptic number.

It is an amenable number.

1091939636 is a deficient number, since it is larger than the sum of its proper divisors (820159504).

1091939636 is a wasteful number, since it uses less digits than its factorization.

1091939636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172114 (or 172112 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 47.

The square root of 1091939636 is about 33044.5099222246. The cubic root of 1091939636 is about 1029.7525518625.

The spelling of 1091939636 in words is "one billion, ninety-one million, nine hundred thirty-nine thousand, six hundred thirty-six".