55236691 has 4 divisors (see below), whose sum is σ = 55993432. Its totient is φ = 54479952.

The previous prime is 55236683. The next prime is 55236719. The reversal of 55236691 is 19663255.

55236691 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.

It is a cyclic number.

It is not a de Polignac number, because 55236691 - 2³ = 55236683 is a prime.

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 55236691.

It is not an unprimeable number, because it can be changed into a prime (55236631) 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, 378261 + ... + 378406.

It is an arithmetic number, because the mean of its divisors is an integer number (13998358).

Almost surely, 2^55236691 is an apocalyptic number.

55236691 is a deficient number, since it is larger than the sum of its proper divisors (756741).

55236691 is an equidigital number, since it uses as much as digits as its factorization.

55236691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756740.

The product of its digits is 48600, while the sum is 37.

The square root of 55236691 is about 7432.1390595171. The cubic root of 55236691 is about 380.8399954571.

The spelling of 55236691 in words is "fifty-five million, two hundred thirty-six thousand, six hundred ninety-one".