163616861 has 2 divisors, whose sum is σ = 163616862. Its totient is φ = 163616860.

The previous prime is 163616837. The next prime is 163616867. The reversal of 163616861 is 168616361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163584100 + 32761 = 12790^2 + 181^2 .

It is a cyclic number.

It is not a de Polignac number, because 163616861 - 2⁶ = 163616797 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (163616867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81808430 + 81808431.

It is an arithmetic number, because the mean of its divisors is an integer number (81808431).

Almost surely, 2^163616861 is an apocalyptic number.

It is an amenable number.

163616861 is a deficient number, since it is larger than the sum of its proper divisors (1).

163616861 is an equidigital number, since it uses as much as digits as its factorization.

163616861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 163616861 is about 12791.2806630142. The cubic root of 163616861 is about 546.9437771067.

The spelling of 163616861 in words is "one hundred sixty-three million, six hundred sixteen thousand, eight hundred sixty-one".