163561213 has 2 divisors, whose sum is σ = 163561214. Its totient is φ = 163561212.

The previous prime is 163561183. The next prime is 163561231. The reversal of 163561213 is 312165361.

Together with next prime (163561231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133333209 + 30228004 = 11547^2 + 5498^2 .

It is a cyclic number.

It is not a de Polignac number, because 163561213 - 2⁹ = 163560701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163561283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81780606 + 81780607.

It is an arithmetic number, because the mean of its divisors is an integer number (81780607).

Almost surely, 2^163561213 is an apocalyptic number.

It is an amenable number.

163561213 is a deficient number, since it is larger than the sum of its proper divisors (1).

163561213 is an equidigital number, since it uses as much as digits as its factorization.

163561213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 163561213 is about 12789.1052462633. The cubic root of 163561213 is about 546.8817627594.

The spelling of 163561213 in words is "one hundred sixty-three million, five hundred sixty-one thousand, two hundred thirteen".