1319506381 has 2 divisors, whose sum is σ = 1319506382. Its totient is φ = 1319506380.

The previous prime is 1319506379. The next prime is 1319506399. The reversal of 1319506381 is 1836059131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1243972900 + 75533481 = 35270^2 + 8691^2 .

It is a cyclic number.

It is not a de Polignac number, because 1319506381 - 2¹ = 1319506379 is a prime.

It is a super-2 number, since 2×1319506381² = 3482194178999434322, which contains 22 as substring.

Together with 1319506379, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1319506381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1319506081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659753190 + 659753191.

It is an arithmetic number, because the mean of its divisors is an integer number (659753191).

Almost surely, 2^1319506381 is an apocalyptic number.

It is an amenable number.

1319506381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1319506381 is an equidigital number, since it uses as much as digits as its factorization.

1319506381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1319506381 is about 36325.0104060549. The cubic root of 1319506381 is about 1096.8245558261.

The spelling of 1319506381 in words is "one billion, three hundred nineteen million, five hundred six thousand, three hundred eighty-one".