54783991 has 4 divisors (see below), whose sum is σ = 54823000. Its totient is φ = 54744984.

The previous prime is 54783977. The next prime is 54783997. The reversal of 54783991 is 19938745.

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 54783991 - 2⁵ = 54783959 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 (54783997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17316 + ... + 20233.

It is an arithmetic number, because the mean of its divisors is an integer number (13705750).

Almost surely, 2^54783991 is an apocalyptic number.

54783991 is a deficient number, since it is larger than the sum of its proper divisors (39009).

54783991 is a wasteful number, since it uses less digits than its factorization.

54783991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39008.

The product of its digits is 272160, while the sum is 46.

The square root of 54783991 is about 7401.6208360061. The cubic root of 54783991 is about 379.7967310840.

The spelling of 54783991 in words is "fifty-four million, seven hundred eighty-three thousand, nine hundred ninety-one".