54809639 has 4 divisors (see below), whose sum is σ = 54824760. Its totient is φ = 54794520.

The previous prime is 54809603. The next prime is 54809663. The reversal of 54809639 is 93690845.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 54809639 - 2⁸ = 54809383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 54809639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54809039) 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 3 ways as a sum of consecutive naturals, for example, 1484 + ... + 10574.

It is an arithmetic number, because the mean of its divisors is an integer number (13706190).

Almost surely, 2^54809639 is an apocalyptic number.

54809639 is a deficient number, since it is larger than the sum of its proper divisors (15121).

54809639 is an equidigital number, since it uses as much as digits as its factorization.

54809639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15120.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 54809639 is about 7403.3532267480. The cubic root of 54809639 is about 379.8559911381.

The spelling of 54809639 in words is "fifty-four million, eight hundred nine thousand, six hundred thirty-nine".