2057679509 has 4 divisors (see below), whose sum is σ = 2058027840. Its totient is φ = 2057331180.

The previous prime is 2057679469. The next prime is 2057679553. The reversal of 2057679509 is 9059767502.

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 an emirpimes, since its reverse is a distinct semiprime: 9059767502 = 2 ⋅4529883751.

It is a cyclic number.

It is not a de Polignac number, because 2057679509 - 2²⁸ = 1789244053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2057679709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165149 + ... + 177170.

It is an arithmetic number, because the mean of its divisors is an integer number (514506960).

Almost surely, 2^2057679509 is an apocalyptic number.

It is an amenable number.

2057679509 is a deficient number, since it is larger than the sum of its proper divisors (348331).

2057679509 is an equidigital number, since it uses as much as digits as its factorization.

2057679509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348330.

The product of its (nonzero) digits is 1190700, while the sum is 50.

The square root of 2057679509 is about 45361.6524059695. The cubic root of 2057679509 is about 1271.9183831198.

The spelling of 2057679509 in words is "two billion, fifty-seven million, six hundred seventy-nine thousand, five hundred nine".