201631163 has 4 divisors (see below), whose sum is σ = 202868328. Its totient is φ = 200394000.

The previous prime is 201631159. The next prime is 201631181. The reversal of 201631163 is 361136102.

It is a happy number.

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 201631163 - 2² = 201631159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201631103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618338 + ... + 618663.

It is an arithmetic number, because the mean of its divisors is an integer number (50717082).

Almost surely, 2^201631163 is an apocalyptic number.

201631163 is a deficient number, since it is larger than the sum of its proper divisors (1237165).

201631163 is a wasteful number, since it uses less digits than its factorization.

201631163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237164.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 201631163 is about 14199.6888346189. The cubic root of 201631163 is about 586.3890947954.

Adding to 201631163 its reverse (361136102), we get a palindrome (562767265).

The spelling of 201631163 in words is "two hundred one million, six hundred thirty-one thousand, one hundred sixty-three".