2163618491 has 2 divisors, whose sum is σ = 2163618492. Its totient is φ = 2163618490.

The previous prime is 2163618473. The next prime is 2163618511. The reversal of 2163618491 is 1948163612.

2163618491 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 is a cyclic number.

It is not a de Polignac number, because 2163618491 - 2⁶ = 2163618427 is a prime.

It is not a weakly prime, because it can be changed into another prime (2163618091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081809245 + 1081809246.

It is an arithmetic number, because the mean of its divisors is an integer number (1081809246).

Almost surely, 2^2163618491 is an apocalyptic number.

2163618491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2163618491 is an equidigital number, since it uses as much as digits as its factorization.

2163618491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 2163618491 is about 46514.7126294466. The cubic root of 2163618491 is about 1293.3822448836.

The spelling of 2163618491 in words is "two billion, one hundred sixty-three million, six hundred eighteen thousand, four hundred ninety-one".