1091272863 has 8 divisors (see below), whose sum is σ = 1455979648. Its totient is φ = 727040664.

The previous prime is 1091272849. The next prime is 1091272873. The reversal of 1091272863 is 3682721901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1091272863 - 2⁸ = 1091272607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091272873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113245 + ... + 122502.

It is an arithmetic number, because the mean of its divisors is an integer number (181997456).

Almost surely, 2^1091272863 is an apocalyptic number.

1091272863 is a deficient number, since it is larger than the sum of its proper divisors (364706785).

1091272863 is a wasteful number, since it uses less digits than its factorization.

1091272863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237293.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 1091272863 is about 33034.4193682892. The cubic root of 1091272863 is about 1029.5429093210.

The spelling of 1091272863 in words is "one billion, ninety-one million, two hundred seventy-two thousand, eight hundred sixty-three".