54866191 has 4 divisors (see below), whose sum is σ = 58093632. Its totient is φ = 51638752.

The previous prime is 54866179. The next prime is 54866213. The reversal of 54866191 is 19166845.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19166845 = 5 ⋅3833369.

It is a cyclic number.

It is not a de Polignac number, because 54866191 - 2²³ = 46477583 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 (54866491) 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, 1613695 + ... + 1613728.

It is an arithmetic number, because the mean of its divisors is an integer number (14523408).

Almost surely, 2^54866191 is an apocalyptic number.

54866191 is a deficient number, since it is larger than the sum of its proper divisors (3227441).

54866191 is a wasteful number, since it uses less digits than its factorization.

54866191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227440.

The product of its digits is 51840, while the sum is 40.

The square root of 54866191 is about 7407.1715924501. The cubic root of 54866191 is about 379.9865900162.

The spelling of 54866191 in words is "fifty-four million, eight hundred sixty-six thousand, one hundred ninety-one".