163078381 has 2 divisors, whose sum is σ = 163078382. Its totient is φ = 163078380.

The previous prime is 163078343. The next prime is 163078411. The reversal of 163078381 is 183870361.

163078381 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., 141372100 + 21706281 = 11890^2 + 4659^2 .

It is a cyclic number.

It is not a de Polignac number, because 163078381 - 2²¹ = 160981229 is a prime.

It is a super-2 number, since 2×163078381² = 53189116699162322, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 163078381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163078481) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81539190 + 81539191.

It is an arithmetic number, because the mean of its divisors is an integer number (81539191).

Almost surely, 2^163078381 is an apocalyptic number.

It is an amenable number.

163078381 is a deficient number, since it is larger than the sum of its proper divisors (1).

163078381 is an equidigital number, since it uses as much as digits as its factorization.

163078381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 163078381 is about 12770.2146027387. The cubic root of 163078381 is about 546.3431014957.

The spelling of 163078381 in words is "one hundred sixty-three million, seventy-eight thousand, three hundred eighty-one".