163561331 has 4 divisors (see below), whose sum is σ = 163752600. Its totient is φ = 163370064.

The previous prime is 163561327. The next prime is 163561361. The reversal of 163561331 is 133165361.

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

It is a cyclic number.

It is not a de Polignac number, because 163561331 - 2² = 163561327 is a prime.

It is a super-2 number, since 2×163561331² = 53504617996983122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163561294 and 163561303.

It is not an unprimeable number, because it can be changed into a prime (163561361) 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, 94346 + ... + 96063.

It is an arithmetic number, because the mean of its divisors is an integer number (40938150).

Almost surely, 2^163561331 is an apocalyptic number.

163561331 is a deficient number, since it is larger than the sum of its proper divisors (191269).

163561331 is an equidigital number, since it uses as much as digits as its factorization.

163561331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191268.

The product of its digits is 4860, while the sum is 29.

The square root of 163561331 is about 12789.1098595641. The cubic root of 163561331 is about 546.8818942739.

The spelling of 163561331 in words is "one hundred sixty-three million, five hundred sixty-one thousand, three hundred thirty-one".