55143233 has 4 divisors (see below), whose sum is σ = 55473600. Its totient is φ = 54812868.

The previous prime is 55143227. The next prime is 55143241. The reversal of 55143233 is 33234155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33234155 = 5 ⋅6646831.

It is a cyclic number.

It is not a de Polignac number, because 55143233 - 2⁶ = 55143169 is a prime.

It is a super-2 number, since 2×55143233² = 6081552291384578, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55146233) 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, 164933 + ... + 165266.

It is an arithmetic number, because the mean of its divisors is an integer number (13868400).

Almost surely, 2^55143233 is an apocalyptic number.

It is an amenable number.

55143233 is a deficient number, since it is larger than the sum of its proper divisors (330367).

55143233 is a wasteful number, since it uses less digits than its factorization.

55143233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330366.

The product of its digits is 5400, while the sum is 26.

The square root of 55143233 is about 7425.8489750331. The cubic root of 55143233 is about 380.6250861507.

Adding to 55143233 its reverse (33234155), we get a palindrome (88377388).

The spelling of 55143233 in words is "fifty-five million, one hundred forty-three thousand, two hundred thirty-three".