2154643811 has 2 divisors, whose sum is σ = 2154643812. Its totient is φ = 2154643810.

The previous prime is 2154643793. The next prime is 2154643819. The reversal of 2154643811 is 1183464512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2154643811 - 2¹⁴ = 2154627427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2154643819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077321905 + 1077321906.

It is an arithmetic number, because the mean of its divisors is an integer number (1077321906).

Almost surely, 2^2154643811 is an apocalyptic number.

2154643811 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154643811 is an equidigital number, since it uses as much as digits as its factorization.

2154643811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 35.

The square root of 2154643811 is about 46418.1409688066. The cubic root of 2154643811 is about 1291.5914519052.

The spelling of 2154643811 in words is "two billion, one hundred fifty-four million, six hundred forty-three thousand, eight hundred eleven".