163941509 has 4 divisors (see below), whose sum is σ = 163989420. Its totient is φ = 163893600.

The previous prime is 163941497. The next prime is 163941541. The reversal of 163941509 is 905149361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34550884 + 129390625 = 5878^2 + 11375^2 .

It is a cyclic number.

It is not a de Polignac number, because 163941509 - 2¹⁶ = 163875973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163941109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18392 + ... + 25809.

It is an arithmetic number, because the mean of its divisors is an integer number (40997355).

Almost surely, 2^163941509 is an apocalyptic number.

It is an amenable number.

163941509 is a deficient number, since it is larger than the sum of its proper divisors (47911).

163941509 is an equidigital number, since it uses as much as digits as its factorization.

163941509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47910.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 163941509 is about 12803.9645813318. The cubic root of 163941509 is about 547.3052860832.

The spelling of 163941509 in words is "one hundred sixty-three million, nine hundred forty-one thousand, five hundred nine".