231212431 has 2 divisors, whose sum is σ = 231212432. Its totient is φ = 231212430.

The previous prime is 231212383. The next prime is 231212441. The reversal of 231212431 is 134212132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231212431 - 2²¹ = 229115279 is a prime.

It is a super-2 number, since 2×231212431² = 106918376497859522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231212399 and 231212408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231212441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115606215 + 115606216.

It is an arithmetic number, because the mean of its divisors is an integer number (115606216).

Almost surely, 2^231212431 is an apocalyptic number.

231212431 is a deficient number, since it is larger than the sum of its proper divisors (1).

231212431 is an equidigital number, since it uses as much as digits as its factorization.

231212431 is an odious number, because the sum of its binary digits is odd.

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

The square root of 231212431 is about 15205.6710144604. The cubic root of 231212431 is about 613.7672718415.

Adding to 231212431 its reverse (134212132), we get a palindrome (365424563).

It can be divided in two parts, 23121 and 2431, that added together give a palindrome (25552).

The spelling of 231212431 in words is "two hundred thirty-one million, two hundred twelve thousand, four hundred thirty-one".