1331224399 has 2 divisors, whose sum is σ = 1331224400. Its totient is φ = 1331224398.

The previous prime is 1331224397. The next prime is 1331224409. The reversal of 1331224399 is 9934221331.

It is a weak prime.

It is an emirp because it is prime and its reverse (9934221331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331224399 - 2¹ = 1331224397 is a prime.

It is a super-2 number, since 2×1331224399² = 3544316800985822402, which contains 22 as substring.

Together with 1331224397, 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 (1331224393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665612199 + 665612200.

It is an arithmetic number, because the mean of its divisors is an integer number (665612200).

Almost surely, 2^1331224399 is an apocalyptic number.

1331224399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331224399 is an equidigital number, since it uses as much as digits as its factorization.

1331224399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 37.

The square root of 1331224399 is about 36485.9479663062. The cubic root of 1331224399 is about 1100.0618144326.

The spelling of 1331224399 in words is "one billion, three hundred thirty-one million, two hundred twenty-four thousand, three hundred ninety-nine".