131224121 has 8 divisors (see below), whose sum is σ = 150097920. Its totient is φ = 112382208.

The previous prime is 131224097. The next prime is 131224157. The reversal of 131224121 is 121422131.

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 131224121 - 2⁶ = 131224057 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131224121.

It is not an unprimeable number, because it can be changed into a prime (131224021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1625 + ... + 16281.

It is an arithmetic number, because the mean of its divisors is an integer number (18762240).

Almost surely, 2^131224121 is an apocalyptic number.

It is an amenable number.

131224121 is a deficient number, since it is larger than the sum of its proper divisors (18873799).

131224121 is a wasteful number, since it uses less digits than its factorization.

131224121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15943.

The product of its digits is 96, while the sum is 17.

The square root of 131224121 is about 11455.3097295534. The cubic root of 131224121 is about 508.1647751690.

Adding to 131224121 its reverse (121422131), we get a palindrome (252646252).

The spelling of 131224121 in words is "one hundred thirty-one million, two hundred twenty-four thousand, one hundred twenty-one".