55982191 has 4 divisors (see below), whose sum is σ = 56013984. Its totient is φ = 55950400.

The previous prime is 55982183. The next prime is 55982219. The reversal of 55982191 is 19128955.

It is a semiprime because it is the product of two primes.

It is a 6-Lehmer number, since φ(55982191) divides (55982191-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 55982191 - 2³ = 55982183 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55982141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13090 + ... + 16831.

It is an arithmetic number, because the mean of its divisors is an integer number (14003496).

Almost surely, 2^55982191 is an apocalyptic number.

55982191 is a deficient number, since it is larger than the sum of its proper divisors (31793).

55982191 is a wasteful number, since it uses less digits than its factorization.

55982191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31792.

The product of its digits is 32400, while the sum is 40.

The square root of 55982191 is about 7482.1247650651. The cubic root of 55982191 is about 382.5456758361.

The spelling of 55982191 in words is "fifty-five million, nine hundred eighty-two thousand, one hundred ninety-one".