2154262109 has 2 divisors, whose sum is σ = 2154262110. Its totient is φ = 2154262108.

The previous prime is 2154262093. The next prime is 2154262147. The reversal of 2154262109 is 9012624512.

2154262109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1344688900 + 809573209 = 36670^2 + 28453^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154262109 - 2⁴ = 2154262093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154232109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077131054 + 1077131055.

It is an arithmetic number, because the mean of its divisors is an integer number (1077131055).

Almost surely, 2^2154262109 is an apocalyptic number.

It is an amenable number.

2154262109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154262109 is an equidigital number, since it uses as much as digits as its factorization.

2154262109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 2154262109 is about 46414.0292260864. The cubic root of 2154262109 is about 1291.5151775572.

The spelling of 2154262109 in words is "two billion, one hundred fifty-four million, two hundred sixty-two thousand, one hundred nine".