55231639 has 4 divisors (see below), whose sum is σ = 56724424. Its totient is φ = 53738856.

The previous prime is 55231621. The next prime is 55231663. The reversal of 55231639 is 93613255.

It is a happy number.

55231639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55231639 - 2¹³ = 55223447 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 (55231619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746337 + ... + 746410.

It is an arithmetic number, because the mean of its divisors is an integer number (14181106).

Almost surely, 2^55231639 is an apocalyptic number.

55231639 is a deficient number, since it is larger than the sum of its proper divisors (1492785).

55231639 is a wasteful number, since it uses less digits than its factorization.

55231639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492784.

The product of its digits is 24300, while the sum is 34.

The square root of 55231639 is about 7431.7991765117. The cubic root of 55231639 is about 380.8283844410.

The spelling of 55231639 in words is "fifty-five million, two hundred thirty-one thousand, six hundred thirty-nine".