1809056089 has 3 divisors (see below), whose sum is σ = 1809098623. Its totient is φ = 1809013556.

The previous prime is 1809056087. The next prime is 1809056149. The reversal of 1809056089 is 9806509081.

The square root of 1809056089 is 42533.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9806509081 = 23227 ⋅422203.

It can be written as a sum of positive squares in only one way, i.e., 562401225 + 1246654864 = 23715^2 + 35308^2 .

It is not a de Polignac number, because 1809056089 - 2¹ = 1809056087 is a prime.

It is a super-3 number, since 3×1809056089³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1809056087) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 21267 + ... + 63799.

Almost surely, 2^1809056089 is an apocalyptic number.

1809056089 is the 42533-rd square number.

1809056089 is the 21267-th centered octagonal number.

It is an amenable number.

1809056089 is a deficient number, since it is larger than the sum of its proper divisors (42534).

1809056089 is an frugal number, since it uses more digits than its factorization.

1809056089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85066 (or 42533 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 46.

The cubic root of 1809056089 is about 1218.4770230479.

The spelling of 1809056089 in words is "one billion, eight hundred nine million, fifty-six thousand, eighty-nine".