1091392857 has 12 divisors (see below), whose sum is σ = 1577384484. Its totient is φ = 727166880.

The previous prime is 1091392853. The next prime is 1091392859. The reversal of 1091392857 is 7582931901.

It can be written as a sum of positive squares in 2 ways, for example, as 473323536 + 618069321 = 21756^2 + 24861^2 .

It is not a de Polignac number, because 1091392857 - 2² = 1091392853 is a prime.

It is a super-2 number, since 2×1091392857² = 2382276736621244898, which contains 22 as substring.

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 a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (1091392853) 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 11 ways as a sum of consecutive naturals, for example, 19158 + ... + 50495.

It is an arithmetic number, because the mean of its divisors is an integer number (131448707).

Almost surely, 2^1091392857 is an apocalyptic number.

It is an amenable number.

1091392857 is a deficient number, since it is larger than the sum of its proper divisors (485991627).

1091392857 is a wasteful number, since it uses less digits than its factorization.

1091392857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71400 (or 71397 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 1091392857 is about 33036.2355149614. The cubic root of 1091392857 is about 1029.5806433740.

The spelling of 1091392857 in words is "one billion, ninety-one million, three hundred ninety-two thousand, eight hundred fifty-seven".