55691139 has 8 divisors (see below), whose sum is σ = 84862720. Its totient is φ = 31823496.

The previous prime is 55691117. The next prime is 55691177. The reversal of 55691139 is 93119655.

55691139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 55691139 - 2⁷ = 55691011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55691097 and 55691106.

It is not an unprimeable number, because it can be changed into a prime (55691239) 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 7 ways as a sum of consecutive naturals, for example, 1325959 + ... + 1326000.

It is an arithmetic number, because the mean of its divisors is an integer number (10607840).

Almost surely, 2^55691139 is an apocalyptic number.

55691139 is a deficient number, since it is larger than the sum of its proper divisors (29171581).

55691139 is a wasteful number, since it uses less digits than its factorization.

55691139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651969.

The product of its digits is 36450, while the sum is 39.

The square root of 55691139 is about 7462.6495964905. The cubic root of 55691139 is about 381.8815706085.

The spelling of 55691139 in words is "fifty-five million, six hundred ninety-one thousand, one hundred thirty-nine".