1088165821 has 4 divisors (see below), whose sum is σ = 1094681952. Its totient is φ = 1081649692.

The previous prime is 1088165803. The next prime is 1088165831. The reversal of 1088165821 is 1285618801.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1285618801 = 1229 ⋅1046069.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1088165821 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 (1088165831) 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, 3257815 + ... + 3258148.

It is an arithmetic number, because the mean of its divisors is an integer number (273670488).

Almost surely, 2^1088165821 is an apocalyptic number.

It is an amenable number.

1088165821 is a deficient number, since it is larger than the sum of its proper divisors (6516131).

1088165821 is an equidigital number, since it uses as much as digits as its factorization.

1088165821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6516130.

The product of its (nonzero) digits is 30720, while the sum is 40.

The square root of 1088165821 is about 32987.3585029174. The cubic root of 1088165821 is about 1028.5648851390.

The spelling of 1088165821 in words is "one billion, eighty-eight million, one hundred sixty-five thousand, eight hundred twenty-one".