55403133 has 4 divisors (see below), whose sum is σ = 73870848. Its totient is φ = 36935420.

The previous prime is 55403129. The next prime is 55403147. The reversal of 55403133 is 33130455.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 55403133 - 2² = 55403129 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55403233) 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, 9233853 + ... + 9233858.

It is an arithmetic number, because the mean of its divisors is an integer number (18467712).

Almost surely, 2^55403133 is an apocalyptic number.

It is an amenable number.

55403133 is a deficient number, since it is larger than the sum of its proper divisors (18467715).

55403133 is a wasteful number, since it uses less digits than its factorization.

55403133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18467714.

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 55403133 is about 7443.3280862797. The cubic root of 55403133 is about 381.2221340199. Note that the first 3 decimals are identical.

Adding to 55403133 its reverse (33130455), we get a palindrome (88533588).

The spelling of 55403133 in words is "fifty-five million, four hundred three thousand, one hundred thirty-three".