163121231 has 16 divisors (see below), whose sum is σ = 205438464. Its totient is φ = 126058464.

The previous prime is 163121219. The next prime is 163121237. The reversal of 163121231 is 132121361.

It is not a de Polignac number, because 163121231 - 2²² = 158926927 is a prime.

It is a super-2 number, since 2×163121231² = 53217072005910722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163121237) 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 15 ways as a sum of consecutive naturals, for example, 16931 + ... + 24756.

It is an arithmetic number, because the mean of its divisors is an integer number (12839904).

Almost surely, 2^163121231 is an apocalyptic number.

163121231 is a deficient number, since it is larger than the sum of its proper divisors (42317233).

163121231 is a wasteful number, since it uses less digits than its factorization.

163121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41750.

The product of its digits is 216, while the sum is 20.

The square root of 163121231 is about 12771.8922247254. The cubic root of 163121231 is about 546.3909491454.

Adding to 163121231 its reverse (132121361), we get a palindrome (295242592).

The spelling of 163121231 in words is "one hundred sixty-three million, one hundred twenty-one thousand, two hundred thirty-one".