1072771209 has 20 divisors (see below), whose sum is σ = 1619067604. Its totient is φ = 707802624.

The previous prime is 1072771187. The next prime is 1072771211. The reversal of 1072771209 is 9021772701.

It can be written as a sum of positive squares in 2 ways, for example, as 638673984 + 434097225 = 25272^2 + 20835^2 .

It is not a de Polignac number, because 1072771209 - 2¹³ = 1072763017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1072771279) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 60412 + ... + 76125.

Almost surely, 2^1072771209 is an apocalyptic number.

It is an amenable number.

1072771209 is a deficient number, since it is larger than the sum of its proper divisors (546296395).

1072771209 is an equidigital number, since it uses as much as digits as its factorization.

1072771209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136646 (or 136637 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 36.

The square root of 1072771209 is about 32753.1862419521. The cubic root of 1072771209 is about 1023.6913567825.

The spelling of 1072771209 in words is "one billion, seventy-two million, seven hundred seventy-one thousand, two hundred nine".