55138833 has 8 divisors (see below), whose sum is σ = 81687200. Its totient is φ = 36759204.

The previous prime is 55138819. The next prime is 55138847. The reversal of 55138833 is 33883155.

It is an interprime number because it is at equal distance from previous prime (55138819) and next prime (55138847).

It is a de Polignac number, because none of the positive numbers 2^k-55138833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55138033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1021063 + ... + 1021116.

It is an arithmetic number, because the mean of its divisors is an integer number (10210900).

Almost surely, 2^55138833 is an apocalyptic number.

It is an amenable number.

55138833 is a deficient number, since it is larger than the sum of its proper divisors (26548367).

55138833 is a wasteful number, since it uses less digits than its factorization.

55138833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042188 (or 2042182 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 55138833 is about 7425.5527067014. The cubic root of 55138833 is about 380.6149622435.

The spelling of 55138833 in words is "fifty-five million, one hundred thirty-eight thousand, eight hundred thirty-three".