1331942399 has 2 divisors, whose sum is σ = 1331942400. Its totient is φ = 1331942398.

The previous prime is 1331942393. The next prime is 1331942407. The reversal of 1331942399 is 9932491331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1331942399 - 2²⁴ = 1315165183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331942393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665971199 + 665971200.

It is an arithmetic number, because the mean of its divisors is an integer number (665971200).

Almost surely, 2^1331942399 is an apocalyptic number.

1331942399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331942399 is an equidigital number, since it uses as much as digits as its factorization.

1331942399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 44.

The square root of 1331942399 is about 36495.7860444189. The cubic root of 1331942399 is about 1100.2595528014.

The spelling of 1331942399 in words is "one billion, three hundred thirty-one million, nine hundred forty-two thousand, three hundred ninety-nine".