55120823 has 2 divisors, whose sum is σ = 55120824. Its totient is φ = 55120822.

The previous prime is 55120799. The next prime is 55120837. The reversal of 55120823 is 32802155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55120823 - 2¹² = 55116727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55120792 and 55120801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55120853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27560411 + 27560412.

It is an arithmetic number, because the mean of its divisors is an integer number (27560412).

Almost surely, 2^55120823 is an apocalyptic number.

55120823 is a deficient number, since it is larger than the sum of its proper divisors (1).

55120823 is an equidigital number, since it uses as much as digits as its factorization.

55120823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 55120823 is about 7424.3399033180. The cubic root of 55120823 is about 380.5735176356.

Adding to 55120823 its reverse (32802155), we get a palindrome (87922978).

The spelling of 55120823 in words is "fifty-five million, one hundred twenty thousand, eight hundred twenty-three".