1091689797 has 16 divisors (see below), whose sum is σ = 1588834368. Its totient is φ = 661246080.

The previous prime is 1091689789. The next prime is 1091689801. The reversal of 1091689797 is 7979861901.

It is not a de Polignac number, because 1091689797 - 2³ = 1091689789 is a prime.

It is a super-2 number, since 2×1091689797² = 2383573225747802418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091689747) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 54483 + ... + 71775.

It is an arithmetic number, because the mean of its divisors is an integer number (99302148).

Almost surely, 2^1091689797 is an apocalyptic number.

It is an amenable number.

1091689797 is a deficient number, since it is larger than the sum of its proper divisors (497144571).

1091689797 is a wasteful number, since it uses less digits than its factorization.

1091689797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19220.

The product of its (nonzero) digits is 1714608, while the sum is 57.

The square root of 1091689797 is about 33040.7293654362. The cubic root of 1091689797 is about 1029.6740090678.

The spelling of 1091689797 in words is "one billion, ninety-one million, six hundred eighty-nine thousand, seven hundred ninety-seven".