2167481809 has 2 divisors, whose sum is σ = 2167481810. Its totient is φ = 2167481808.

The previous prime is 2167481807. The next prime is 2167481831. The reversal of 2167481809 is 9081847612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2034010000 + 133471809 = 45100^2 + 11553^2 .

It is a cyclic number.

It is not a de Polignac number, because 2167481809 - 2¹ = 2167481807 is a prime.

Together with 2167481807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2167481803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083740904 + 1083740905.

It is an arithmetic number, because the mean of its divisors is an integer number (1083740905).

Almost surely, 2^2167481809 is an apocalyptic number.

It is an amenable number.

2167481809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2167481809 is an equidigital number, since it uses as much as digits as its factorization.

2167481809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 2167481809 is about 46556.2220224107. Note that the first 3 decimals coincide. The cubic root of 2167481809 is about 1294.1516004549.

The spelling of 2167481809 in words is "two billion, one hundred sixty-seven million, four hundred eighty-one thousand, eight hundred nine".