56686121 has 4 divisors (see below), whose sum is σ = 57270612. Its totient is φ = 56101632.

The previous prime is 56686103. The next prime is 56686127. The reversal of 56686121 is 12168665.

It is a happy number.

56686121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12168665 = 5 ⋅2433733.

It can be written as a sum of positive squares in 2 ways, for example, as 7840000 + 48846121 = 2800^2 + 6989^2 .

It is a cyclic number.

It is not a de Polignac number, because 56686121 - 2⁶ = 56686057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56686127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292100 + ... + 292293.

It is an arithmetic number, because the mean of its divisors is an integer number (14317653).

Almost surely, 2^56686121 is an apocalyptic number.

It is an amenable number.

56686121 is a deficient number, since it is larger than the sum of its proper divisors (584491).

56686121 is an equidigital number, since it uses as much as digits as its factorization.

56686121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584490.

The product of its digits is 17280, while the sum is 35.

The square root of 56686121 is about 7529.0185947439. The cubic root of 56686121 is about 384.1424009802.

The spelling of 56686121 in words is "fifty-six million, six hundred eighty-six thousand, one hundred twenty-one".