1057648309 has 4 divisors (see below), whose sum is σ = 1072136716. Its totient is φ = 1043159904.

The previous prime is 1057648283. The next prime is 1057648331. The reversal of 1057648309 is 9038467501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9038467501 = 7 ⋅1291209643.

It can be written as a sum of positive squares in 2 ways, for example, as 717061284 + 340587025 = 26778^2 + 18455^2 .

It is a cyclic number.

It is not a de Polignac number, because 1057648309 - 2⁷ = 1057648181 is a prime.

It is a super-2 number, since 2×1057648309² = 2237239891061118962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057648349) 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, 7244094 + ... + 7244239.

It is an arithmetic number, because the mean of its divisors is an integer number (268034179).

Almost surely, 2^1057648309 is an apocalyptic number.

It is an amenable number.

1057648309 is a deficient number, since it is larger than the sum of its proper divisors (14488407).

1057648309 is an equidigital number, since it uses as much as digits as its factorization.

1057648309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14488406.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1057648309 is about 32521.5053310882. The cubic root of 1057648309 is about 1018.8582344563.

It can be divided in two parts, 10576 and 48309, that added together give a palindrome (58885).

The spelling of 1057648309 in words is "one billion, fifty-seven million, six hundred forty-eight thousand, three hundred nine".