55968191 has 4 divisors (see below), whose sum is σ = 55992384. Its totient is φ = 55944000.

The previous prime is 55968181. The next prime is 55968193. The reversal of 55968191 is 19186955.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55968191 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 (55968193) 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, 8210 + ... + 13391.

It is an arithmetic number, because the mean of its divisors is an integer number (13998096).

Almost surely, 2^55968191 is an apocalyptic number.

55968191 is a deficient number, since it is larger than the sum of its proper divisors (24193).

55968191 is a wasteful number, since it uses less digits than its factorization.

55968191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24192.

The product of its digits is 97200, while the sum is 44.

The square root of 55968191 is about 7481.1891434450. The cubic root of 55968191 is about 382.5137842299.

The spelling of 55968191 in words is "fifty-five million, nine hundred sixty-eight thousand, one hundred ninety-one".