55102191 has 4 divisors (see below), whose sum is σ = 73469592. Its totient is φ = 36734792.

The previous prime is 55102129. The next prime is 55102193. The reversal of 55102191 is 19120155.

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 55102191 - 2⁷ = 55102063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55102193) 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, 9183696 + ... + 9183701.

It is an arithmetic number, because the mean of its divisors is an integer number (18367398).

Almost surely, 2^55102191 is an apocalyptic number.

55102191 is a deficient number, since it is larger than the sum of its proper divisors (18367401).

55102191 is a wasteful number, since it uses less digits than its factorization.

55102191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18367400.

The product of its (nonzero) digits is 450, while the sum is 24.

The square root of 55102191 is about 7423.0850055755. The cubic root of 55102191 is about 380.5306321796.

The spelling of 55102191 in words is "fifty-five million, one hundred two thousand, one hundred ninety-one".