2164251899 has 2 divisors, whose sum is σ = 2164251900. Its totient is φ = 2164251898.

The previous prime is 2164251821. The next prime is 2164251913. The reversal of 2164251899 is 9981524612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2164251899 - 2²⁰ = 2163203323 is a prime.

It is not a weakly prime, because it can be changed into another prime (2164251499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082125949 + 1082125950.

It is an arithmetic number, because the mean of its divisors is an integer number (1082125950).

Almost surely, 2^2164251899 is an apocalyptic number.

2164251899 is a deficient number, since it is larger than the sum of its proper divisors (1).

2164251899 is an equidigital number, since it uses as much as digits as its factorization.

2164251899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 47.

The square root of 2164251899 is about 46521.5208156397. The cubic root of 2164251899 is about 1293.5084468507.

The spelling of 2164251899 in words is "two billion, one hundred sixty-four million, two hundred fifty-one thousand, eight hundred ninety-nine".