54215838191 has 2 divisors, whose sum is σ = 54215838192. Its totient is φ = 54215838190.

The previous prime is 54215838121. The next prime is 54215838203. The reversal of 54215838191 is 19183851245.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 54215838191 - 2²² = 54211643887 is a prime.

It is a super-2 number, since 2×54215838191² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54215838121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27107919095 + 27107919096.

It is an arithmetic number, because the mean of its divisors is an integer number (27107919096).

Almost surely, 2^54215838191 is an apocalyptic number.

54215838191 is a deficient number, since it is larger than the sum of its proper divisors (1).

54215838191 is an equidigital number, since it uses as much as digits as its factorization.

54215838191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 47.

The spelling of 54215838191 in words is "fifty-four billion, two hundred fifteen million, eight hundred thirty-eight thousand, one hundred ninety-one".