2011167857 has 4 divisors (see below), whose sum is σ = 2011641060. Its totient is φ = 2010694656.

The previous prime is 2011167773. The next prime is 2011167889. The reversal of 2011167857 is 7587611102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1492740496 + 518427361 = 38636^2 + 22769^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011167857 - 2⁸ = 2011167601 is a prime.

It is a super-2 number, since 2×2011167857² = 8089592298059944898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2011167857.

It is not an unprimeable number, because it can be changed into a prime (2011167757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230168 + ... + 238745.

It is an arithmetic number, because the mean of its divisors is an integer number (502910265).

Almost surely, 2^2011167857 is an apocalyptic number.

It is an amenable number.

2011167857 is a deficient number, since it is larger than the sum of its proper divisors (473203).

2011167857 is an equidigital number, since it uses as much as digits as its factorization.

2011167857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473202.

The product of its (nonzero) digits is 23520, while the sum is 38.

The square root of 2011167857 is about 44846.0461690883. The cubic root of 2011167857 is about 1262.2618014425.

Adding to 2011167857 its reverse (7587611102), we get a palindrome (9598778959).

The spelling of 2011167857 in words is "two billion, eleven million, one hundred sixty-seven thousand, eight hundred fifty-seven".