212312431 has 2 divisors, whose sum is σ = 212312432. Its totient is φ = 212312430.

The previous prime is 212312417. The next prime is 212312447. The reversal of 212312431 is 134213212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212312431 is a prime.

It is a super-2 number, since 2×212312431² = 90153136714259522, 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 = 212312399 and 212312408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212312411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106156215 + 106156216.

It is an arithmetic number, because the mean of its divisors is an integer number (106156216).

Almost surely, 2^212312431 is an apocalyptic number.

212312431 is a deficient number, since it is larger than the sum of its proper divisors (1).

212312431 is an equidigital number, since it uses as much as digits as its factorization.

212312431 is an evil number, because the sum of its binary digits is even.

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

The square root of 212312431 is about 14570.9447531723. The cubic root of 212312431 is about 596.5659674565.

Adding to 212312431 its reverse (134213212), we get a palindrome (346525643).

The spelling of 212312431 in words is "two hundred twelve million, three hundred twelve thousand, four hundred thirty-one".