163878361 has 2 divisors, whose sum is σ = 163878362. Its totient is φ = 163878360.

The previous prime is 163878347. The next prime is 163878367.

163878361 is nontrivially palindromic in base 10.

163878361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142348761 + 21529600 = 11931^2 + 4640^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 163878361 - 2⁵ = 163878329 is a prime.

It is a super-2 number, since 2×163878361² = 53712234408092642, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (163878367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81939180 + 81939181.

It is an arithmetic number, because the mean of its divisors is an integer number (81939181).

Almost surely, 2^163878361 is an apocalyptic number.

It is an amenable number.

163878361 is a deficient number, since it is larger than the sum of its proper divisors (1).

163878361 is an equidigital number, since it uses as much as digits as its factorization.

163878361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 163878361 is about 12801.4983888606. The cubic root of 163878361 is about 547.2350055853.

The spelling of 163878361 in words is "one hundred sixty-three million, eight hundred seventy-eight thousand, three hundred sixty-one".