121531163 has 8 divisors (see below), whose sum is σ = 137768400. Its totient is φ = 106278048.

The previous prime is 121531159. The next prime is 121531171. The reversal of 121531163 is 361135121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121531163 - 2² = 121531159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121531153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245768 + ... + 246261.

It is an arithmetic number, because the mean of its divisors is an integer number (17221050).

Almost surely, 2^121531163 is an apocalyptic number.

121531163 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121531163 is a deficient number, since it is larger than the sum of its proper divisors (16237237).

121531163 is a wasteful number, since it uses less digits than its factorization.

121531163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492061.

The product of its digits is 540, while the sum is 23.

The square root of 121531163 is about 11024.1173342812. The cubic root of 121531163 is about 495.3314285535.

Adding to 121531163 its reverse (361135121), we get a palindrome (482666284).

The spelling of 121531163 in words is "one hundred twenty-one million, five hundred thirty-one thousand, one hundred sixty-three".