121531343 has 4 divisors (see below), whose sum is σ = 121554888. Its totient is φ = 121507800.

The previous prime is 121531313. The next prime is 121531363. The reversal of 121531343 is 343135121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 343135121 = 7 ⋅49019303.

It is a cyclic number.

It is not a de Polignac number, because 121531343 - 2¹⁰ = 121530319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121531303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308 + ... + 15593.

It is an arithmetic number, because the mean of its divisors is an integer number (30388722).

Almost surely, 2^121531343 is an apocalyptic number.

121531343 is a deficient number, since it is larger than the sum of its proper divisors (23545).

121531343 is an equidigital number, since it uses as much as digits as its factorization.

121531343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23544.

The product of its digits is 1080, while the sum is 23.

The square root of 121531343 is about 11024.1254981971. The cubic root of 121531343 is about 495.3316730987.

Adding to 121531343 its reverse (343135121), we get a palindrome (464666464).

The spelling of 121531343 in words is "one hundred twenty-one million, five hundred thirty-one thousand, three hundred forty-three".