121443131 has 4 divisors (see below), whose sum is σ = 123434064. Its totient is φ = 119452200.

The previous prime is 121443103. The next prime is 121443163. The reversal of 121443131 is 131344121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131344121 = 3617 ⋅36313.

It is a cyclic number.

It is not a de Polignac number, because 121443131 - 2¹⁰ = 121442107 is a prime.

It is a super-2 number, since 2×121443131² = 29496868134166322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121443031) 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, 995375 + ... + 995496.

It is an arithmetic number, because the mean of its divisors is an integer number (30858516).

Almost surely, 2^121443131 is an apocalyptic number.

121443131 is a deficient number, since it is larger than the sum of its proper divisors (1990933).

121443131 is an equidigital number, since it uses as much as digits as its factorization.

121443131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990932.

The product of its digits is 288, while the sum is 20.

The square root of 121443131 is about 11020.1239103741. The cubic root of 121443131 is about 495.2118006654.

Adding to 121443131 its reverse (131344121), we get a palindrome (252787252).

The spelling of 121443131 in words is "one hundred twenty-one million, four hundred forty-three thousand, one hundred thirty-one".