1091521853 has 4 divisors (see below), whose sum is σ = 1098058080. Its totient is φ = 1084985628.

The previous prime is 1091521841. The next prime is 1091521897. The reversal of 1091521853 is 3581251901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1091521853 - 2⁸ = 1091521597 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 (1091521153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3267863 + ... + 3268196.

It is an arithmetic number, because the mean of its divisors is an integer number (274514520).

Almost surely, 2^1091521853 is an apocalyptic number.

It is an amenable number.

1091521853 is a deficient number, since it is larger than the sum of its proper divisors (6536227).

1091521853 is an equidigital number, since it uses as much as digits as its factorization.

1091521853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6536226.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 1091521853 is about 33038.1877983645. The cubic root of 1091521853 is about 1029.6212051667.

It can be divided in two parts, 10915 and 21853, that added together give a 15-th power (32768 = 2¹⁵).

The spelling of 1091521853 in words is "one billion, ninety-one million, five hundred twenty-one thousand, eight hundred fifty-three".