1331334399 has 4 divisors (see below), whose sum is σ = 1775112536. Its totient is φ = 887556264.

The previous prime is 1331334397. The next prime is 1331334439. The reversal of 1331334399 is 9934331331.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1331334399 - 2¹ = 1331334397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331334397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221889064 + ... + 221889069.

It is an arithmetic number, because the mean of its divisors is an integer number (443778134).

Almost surely, 2^1331334399 is an apocalyptic number.

1331334399 is a deficient number, since it is larger than the sum of its proper divisors (443778137).

1331334399 is an equidigital number, since it uses as much as digits as its factorization.

1331334399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443778136.

The product of its digits is 78732, while the sum is 39.

The square root of 1331334399 is about 36487.4553648237. The cubic root of 1331334399 is about 1100.0921132229.

The spelling of 1331334399 in words is "one billion, three hundred thirty-one million, three hundred thirty-four thousand, three hundred ninety-nine".