163993941 has 6 divisors (see below), whose sum is σ = 236880150. Its totient is φ = 109329288.

The previous prime is 163993919. The next prime is 163993969. The reversal of 163993941 is 149399361.

163993941 is a `hidden beast` number, since 1 + 639 + 9 + 3 + 9 + 4 + 1 = 666.

163993941 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 155525841 + 8468100 = 12471^2 + 2910^2 .

It is not a de Polignac number, because 163993941 - 2¹⁹ = 163469653 is a prime.

It is a super-2 number, since 2×163993941² = 53788025369422962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163991941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9110766 + ... + 9110783.

It is an arithmetic number, because the mean of its divisors is an integer number (39480025).

Almost surely, 2^163993941 is an apocalyptic number.

It is an amenable number.

163993941 is a deficient number, since it is larger than the sum of its proper divisors (72886209).

163993941 is a wasteful number, since it uses less digits than its factorization.

163993941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18221555 (or 18221552 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 163993941 is about 12806.0119084749. The cubic root of 163993941 is about 547.3636265085.

The spelling of 163993941 in words is "one hundred sixty-three million, nine hundred ninety-three thousand, nine hundred forty-one".