55039791 has 4 divisors (see below), whose sum is σ = 73386392. Its totient is φ = 36693192.

The previous prime is 55039741. The next prime is 55039799. The reversal of 55039791 is 19793055.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55039791 - 2¹¹ = 55037743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55039799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9173296 + ... + 9173301.

It is an arithmetic number, because the mean of its divisors is an integer number (18346598).

Almost surely, 2^55039791 is an apocalyptic number.

55039791 is a deficient number, since it is larger than the sum of its proper divisors (18346601).

55039791 is a wasteful number, since it uses less digits than its factorization.

55039791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18346600.

The product of its (nonzero) digits is 42525, while the sum is 39.

The square root of 55039791 is about 7418.8807107272. The cubic root of 55039791 is about 380.3869350478.

The spelling of 55039791 in words is "fifty-five million, thirty-nine thousand, seven hundred ninety-one".