1330667381 has 2 divisors, whose sum is σ = 1330667382. Its totient is φ = 1330667380.

The previous prime is 1330667357. The next prime is 1330667399. The reversal of 1330667381 is 1837660331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1322776900 + 7890481 = 36370^2 + 2809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1330667381 is a prime.

It is a super-2 number, since 2×1330667381² = 3541351357714798322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1330667311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665333690 + 665333691.

It is an arithmetic number, because the mean of its divisors is an integer number (665333691).

Almost surely, 2^1330667381 is an apocalyptic number.

It is an amenable number.

1330667381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1330667381 is an equidigital number, since it uses as much as digits as its factorization.

1330667381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 1330667381 is about 36478.3138453520. The cubic root of 1330667381 is about 1099.9083617876.

The spelling of 1330667381 in words is "one billion, three hundred thirty million, six hundred sixty-seven thousand, three hundred eighty-one".