2171863361 has 2 divisors, whose sum is σ = 2171863362. Its totient is φ = 2171863360.

The previous prime is 2171863349. The next prime is 2171863363. The reversal of 2171863361 is 1633681712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1330863361 + 841000000 = 36481^2 + 29000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2171863361 is a prime.

Together with 2171863363, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2171863363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085931680 + 1085931681.

It is an arithmetic number, because the mean of its divisors is an integer number (1085931681).

Almost surely, 2^2171863361 is an apocalyptic number.

It is an amenable number.

2171863361 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171863361 is an equidigital number, since it uses as much as digits as its factorization.

2171863361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 2171863361 is about 46603.2548326831. The cubic root of 2171863361 is about 1295.0230535095.

The spelling of 2171863361 in words is "two billion, one hundred seventy-one million, eight hundred sixty-three thousand, three hundred sixty-one".