1057638817 has 4 divisors (see below), whose sum is σ = 1057720576. Its totient is φ = 1057557060.

The previous prime is 1057638809. The next prime is 1057638823. The reversal of 1057638817 is 7188367501.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7188367501 = 7 ⋅1026909643.

It is a cyclic number.

It is not a de Polignac number, because 1057638817 - 2³ = 1057638809 is a prime.

It is a super-2 number, since 2×1057638817² = 2237199734450318978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1057638847) 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, 16713 + ... + 48934.

It is an arithmetic number, because the mean of its divisors is an integer number (264430144).

Almost surely, 2^1057638817 is an apocalyptic number.

It is an amenable number.

1057638817 is a deficient number, since it is larger than the sum of its proper divisors (81759).

1057638817 is an equidigital number, since it uses as much as digits as its factorization.

1057638817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81758.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 1057638817 is about 32521.3593965566. The cubic root of 1057638817 is about 1018.8551864894.

The spelling of 1057638817 in words is "one billion, fifty-seven million, six hundred thirty-eight thousand, eight hundred seventeen".