11681057 has 4 divisors (see below), whose sum is σ = 12368196. Its totient is φ = 10993920.

The previous prime is 11681053. The next prime is 11681063. The reversal of 11681057 is 75018611.

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 5683456 + 5997601 = 2384^2 + 2449^2 .

It is a cyclic number.

It is not a de Polignac number, because 11681057 - 2² = 11681053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11681053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343544 + ... + 343577.

It is an arithmetic number, because the mean of its divisors is an integer number (3092049).

Almost surely, 2^11681057 is an apocalyptic number.

11681057 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11681057 is a deficient number, since it is larger than the sum of its proper divisors (687139).

11681057 is an equidigital number, since it uses as much as digits as its factorization.

11681057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687138.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 11681057 is about 3417.7561352443. The cubic root of 11681057 is about 226.8962828403.

Adding to 11681057 its reverse (75018611), we get a palindrome (86699668).

The spelling of 11681057 in words is "eleven million, six hundred eighty-one thousand, fifty-seven".