54817891 has 2 divisors, whose sum is σ = 54817892. Its totient is φ = 54817890.

The previous prime is 54817883. The next prime is 54817909. The reversal of 54817891 is 19871845.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 54817891 - 2³ = 54817883 is a prime.

It is not a weakly prime, because it can be changed into another prime (54817691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27408945 + 27408946.

It is an arithmetic number, because the mean of its divisors is an integer number (27408946).

Almost surely, 2^54817891 is an apocalyptic number.

54817891 is a deficient number, since it is larger than the sum of its proper divisors (1).

54817891 is an equidigital number, since it uses as much as digits as its factorization.

54817891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 43.

The square root of 54817891 is about 7403.9105207991. The cubic root of 54817891 is about 379.8750535658.

The spelling of 54817891 in words is "fifty-four million, eight hundred seventeen thousand, eight hundred ninety-one".