1057112809 has 4 divisors (see below), whose sum is σ = 1058555716. Its totient is φ = 1055669904.

The previous prime is 1057112783. The next prime is 1057112827. The reversal of 1057112809 is 9082117501.

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: 9082117501 = 41 ⋅221515061.

It can be written as a sum of positive squares in 2 ways, for example, as 725763600 + 331349209 = 26940^2 + 18203^2 .

It is a cyclic number.

It is not a de Polignac number, because 1057112809 - 2²⁷ = 922895081 is a prime.

It is a super-2 number, since 2×1057112809² = 2234974981903740962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1057112869) 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, 720354 + ... + 721819.

It is an arithmetic number, because the mean of its divisors is an integer number (264638929).

Almost surely, 2^1057112809 is an apocalyptic number.

It is an amenable number.

1057112809 is a deficient number, since it is larger than the sum of its proper divisors (1442907).

1057112809 is an equidigital number, since it uses as much as digits as its factorization.

1057112809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442906.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 1057112809 is about 32513.2712749732. The cubic root of 1057112809 is about 1018.6862520538.

The spelling of 1057112809 in words is "one billion, fifty-seven million, one hundred twelve thousand, eight hundred nine".