55001391 has 4 divisors (see below), whose sum is σ = 73335192. Its totient is φ = 36667592.

The previous prime is 55001369. The next prime is 55001399. The reversal of 55001391 is 19310055.

55001391 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 55001391 - 2⁷ = 55001263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55001399) 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, 9166896 + ... + 9166901.

It is an arithmetic number, because the mean of its divisors is an integer number (18333798).

Almost surely, 2^55001391 is an apocalyptic number.

55001391 is a deficient number, since it is larger than the sum of its proper divisors (18333801).

55001391 is a wasteful number, since it uses less digits than its factorization.

55001391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18333800.

The product of its (nonzero) digits is 675, while the sum is 24.

The square root of 55001391 is about 7416.2922677036. The cubic root of 55001391 is about 380.2984520533.

The spelling of 55001391 in words is "fifty-five million, one thousand, three hundred ninety-one".