2154185317199 has 2 divisors, whose sum is σ = 2154185317200. Its totient is φ = 2154185317198.

The previous prime is 2154185317189. The next prime is 2154185317247. The reversal of 2154185317199 is 9917135814512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2154185317199 - 2¹⁶ = 2154185251663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154185317139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077092658599 + 1077092658600.

It is an arithmetic number, because the mean of its divisors is an integer number (1077092658600).

Almost surely, 2^{2154185317199} is an apocalyptic number.

2154185317199 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154185317199 is an equidigital number, since it uses as much as digits as its factorization.

2154185317199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 56.

The spelling of 2154185317199 in words is "two trillion, one hundred fifty-four billion, one hundred eighty-five million, three hundred seventeen thousand, one hundred ninety-nine".