343431421 has 2 divisors, whose sum is σ = 343431422. Its totient is φ = 343431420.

The previous prime is 343431419. The next prime is 343431437. The reversal of 343431421 is 124134343.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309267396 + 34164025 = 17586^2 + 5845^2 .

It is an emirp because it is prime and its reverse (124134343) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 343431421 - 2¹ = 343431419 is a prime.

Together with 343431419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343431461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171715710 + 171715711.

It is an arithmetic number, because the mean of its divisors is an integer number (171715711).

Almost surely, 2^343431421 is an apocalyptic number.

It is an amenable number.

343431421 is a deficient number, since it is larger than the sum of its proper divisors (1).

343431421 is an equidigital number, since it uses as much as digits as its factorization.

343431421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 25.

The square root of 343431421 is about 18531.9027895141. The cubic root of 343431421 is about 700.2933607127.

Adding to 343431421 its reverse (124134343), we get a palindrome (467565764).

The spelling of 343431421 in words is "three hundred forty-three million, four hundred thirty-one thousand, four hundred twenty-one".