2154218719 has 2 divisors, whose sum is σ = 2154218720. Its totient is φ = 2154218718.

The previous prime is 2154218711. The next prime is 2154218743. The reversal of 2154218719 is 9178124512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2154218719 - 2³ = 2154218711 is a prime.

It is a super-2 number, since 2×2154218719² = 9281316578580001922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154218711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077109359 + 1077109360.

It is an arithmetic number, because the mean of its divisors is an integer number (1077109360).

Almost surely, 2^2154218719 is an apocalyptic number.

2154218719 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154218719 is an equidigital number, since it uses as much as digits as its factorization.

2154218719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 40.

The square root of 2154218719 is about 46413.5618004048. The cubic root of 2154218719 is about 1291.5065064953.

The spelling of 2154218719 in words is "two billion, one hundred fifty-four million, two hundred eighteen thousand, seven hundred nineteen".