163964893 has 2 divisors, whose sum is σ = 163964894. Its totient is φ = 163964892.

The previous prime is 163964839. The next prime is 163964897. The reversal of 163964893 is 398469361.

Together with previous prime (163964839) 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., 162256644 + 1708249 = 12738^2 + 1307^2 .

It is a cyclic number.

It is not a de Polignac number, because 163964893 - 2¹³ = 163956701 is a prime.

It is a super-2 number, since 2×163964893² = 53768972273002898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163964897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81982446 + 81982447.

It is an arithmetic number, because the mean of its divisors is an integer number (81982447).

Almost surely, 2^163964893 is an apocalyptic number.

It is an amenable number.

163964893 is a deficient number, since it is larger than the sum of its proper divisors (1).

163964893 is an equidigital number, since it uses as much as digits as its factorization.

163964893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 49.

The square root of 163964893 is about 12804.8777034379. The cubic root of 163964893 is about 547.3313067017.

The spelling of 163964893 in words is "one hundred sixty-three million, nine hundred sixty-four thousand, eight hundred ninety-three".