163435381 has 2 divisors, whose sum is σ = 163435382. Its totient is φ = 163435380.

The previous prime is 163435367. The next prime is 163435421. The reversal of 163435381 is 183534361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111724900 + 51710481 = 10570^2 + 7191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163435381 is a prime.

It is a super-2 number, since 2×163435381² = 53422247525230322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163435351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81717690 + 81717691.

It is an arithmetic number, because the mean of its divisors is an integer number (81717691).

Almost surely, 2^163435381 is an apocalyptic number.

It is an amenable number.

163435381 is a deficient number, since it is larger than the sum of its proper divisors (1).

163435381 is an equidigital number, since it uses as much as digits as its factorization.

163435381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 163435381 is about 12784.1847999784. The cubic root of 163435381 is about 546.7414832082.

The spelling of 163435381 in words is "one hundred sixty-three million, four hundred thirty-five thousand, three hundred eighty-one".