163198381 has 2 divisors, whose sum is σ = 163198382. Its totient is φ = 163198380.

The previous prime is 163198369. The next prime is 163198393. The reversal of 163198381 is 183891361.

It is a balanced prime because it is at equal distance from previous prime (163198369) and next prime (163198393).

It can be written as a sum of positive squares in only one way, i.e., 140635881 + 22562500 = 11859^2 + 4750^2 .

It is an emirp because it is prime and its reverse (183891361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163198381 - 2⁹ = 163197869 is a prime.

It is a super-2 number, since 2×163198381² = 53267423122042322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163198331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81599190 + 81599191.

It is an arithmetic number, because the mean of its divisors is an integer number (81599191).

Almost surely, 2^163198381 is an apocalyptic number.

It is an amenable number.

163198381 is a deficient number, since it is larger than the sum of its proper divisors (1).

163198381 is an equidigital number, since it uses as much as digits as its factorization.

163198381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 163198381 is about 12774.9121719094. The cubic root of 163198381 is about 546.4770761269.

The spelling of 163198381 in words is "one hundred sixty-three million, one hundred ninety-eight thousand, three hundred eighty-one".