55151223 has 4 divisors (see below), whose sum is σ = 73534968. Its totient is φ = 36767480.

The previous prime is 55151221. The next prime is 55151237. The reversal of 55151223 is 32215155.

It is a happy number.

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 55151223 - 2¹ = 55151221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55151193 and 55151202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55151221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9191868 + ... + 9191873.

It is an arithmetic number, because the mean of its divisors is an integer number (18383742).

Almost surely, 2^55151223 is an apocalyptic number.

55151223 is a deficient number, since it is larger than the sum of its proper divisors (18383745).

55151223 is a wasteful number, since it uses less digits than its factorization.

55151223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18383744.

The product of its digits is 1500, while the sum is 24.

The square root of 55151223 is about 7426.3869411713. The cubic root of 55151223 is about 380.6434688691.

Adding to 55151223 its reverse (32215155), we get a palindrome (87366378).

The spelling of 55151223 in words is "fifty-five million, one hundred fifty-one thousand, two hundred twenty-three".