1331599 has 2 divisors, whose sum is σ = 1331600. Its totient is φ = 1331598.

The previous prime is 1331597. The next prime is 1331611. The reversal of 1331599 is 9951331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1331599 - 2¹ = 1331597 is a prime.

Together with 1331597, it forms a pair of twin primes.

It is a Chen prime.

1331599 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331599.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665799 + 665800.

It is an arithmetic number, because the mean of its divisors is an integer number (665800).

2^1331599 is an apocalyptic number.

1331599 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331599 is an equidigital number, since it uses as much as digits as its factorization.

1331599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3645, while the sum is 31.

The square root of 1331599 is about 1153.9493056456. The cubic root of 1331599 is about 110.0164989026.

The spelling of 1331599 in words is "one million, three hundred thirty-one thousand, five hundred ninety-nine".