1331222447 has 2 divisors, whose sum is σ = 1331222448. Its totient is φ = 1331222446.

The previous prime is 1331222437. The next prime is 1331222449. The reversal of 1331222447 is 7442221331.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331222447 is a prime.

Together with 1331222449, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331222449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665611223 + 665611224.

It is an arithmetic number, because the mean of its divisors is an integer number (665611224).

Almost surely, 2^1331222447 is an apocalyptic number.

1331222447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331222447 is an equidigital number, since it uses as much as digits as its factorization.

1331222447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 29.

The square root of 1331222447 is about 36485.9212162719. The cubic root of 1331222447 is about 1100.0612767517.

Adding to 1331222447 its reverse (7442221331), we get a palindrome (8773443778).

The spelling of 1331222447 in words is "one billion, three hundred thirty-one million, two hundred twenty-two thousand, four hundred forty-seven".