1084091521 has 4 divisors (see below), whose sum is σ = 1104546132. Its totient is φ = 1063636912.

The previous prime is 1084091509. The next prime is 1084091539. The reversal of 1084091521 is 1251904801.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1251904801 = 7 ⋅178843543.

It can be written as a sum of positive squares in 2 ways, for example, as 589518400 + 494573121 = 24280^2 + 22239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1084091521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1084091621) 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 3 ways as a sum of consecutive naturals, for example, 10227226 + ... + 10227331.

It is an arithmetic number, because the mean of its divisors is an integer number (276136533).

Almost surely, 2^1084091521 is an apocalyptic number.

It is an amenable number.

1084091521 is a deficient number, since it is larger than the sum of its proper divisors (20454611).

1084091521 is an equidigital number, since it uses as much as digits as its factorization.

1084091521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20454610.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 1084091521 is about 32925.5451131792. The cubic root of 1084091521 is about 1027.2795653914.

The spelling of 1084091521 in words is "one billion, eighty-four million, ninety-one thousand, five hundred twenty-one".