55191439 has 8 divisors (see below), whose sum is σ = 57065472. Its totient is φ = 53323320.

The previous prime is 55191413. The next prime is 55191443. The reversal of 55191439 is 93419155.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55191439 - 2⁵ = 55191407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55191398 and 55191407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55101439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25722 + ... + 27784.

It is an arithmetic number, because the mean of its divisors is an integer number (7133184).

Almost surely, 2^55191439 is an apocalyptic number.

55191439 is a deficient number, since it is larger than the sum of its proper divisors (1874033).

55191439 is a wasteful number, since it uses less digits than its factorization.

55191439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2957.

The product of its digits is 24300, while the sum is 37.

The square root of 55191439 is about 7429.0940901297. The cubic root of 55191439 is about 380.7359675034.

The spelling of 55191439 in words is "fifty-five million, one hundred ninety-one thousand, four hundred thirty-nine".