121232431 has 4 divisors (see below), whose sum is σ = 121582152. Its totient is φ = 120882712.

The previous prime is 121232401. The next prime is 121232453. The reversal of 121232431 is 134232121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121232431 - 2⁷ = 121232303 is a prime.

It is a super-2 number, since 2×121232431² = 29394604652339522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121232399 and 121232408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121232401) 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 3 ways as a sum of consecutive naturals, for example, 174340 + ... + 175033.

It is an arithmetic number, because the mean of its divisors is an integer number (30395538).

Almost surely, 2^121232431 is an apocalyptic number.

121232431 is a deficient number, since it is larger than the sum of its proper divisors (349721).

121232431 is an equidigital number, since it uses as much as digits as its factorization.

121232431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349720.

The product of its digits is 288, while the sum is 19.

The square root of 121232431 is about 11010.5599766769. The cubic root of 121232431 is about 494.9252425960.

Adding to 121232431 its reverse (134232121), we get a palindrome (255464552).

The spelling of 121232431 in words is "one hundred twenty-one million, two hundred thirty-two thousand, four hundred thirty-one".