13391816381 has 2 divisors, whose sum is σ = 13391816382. Its totient is φ = 13391816380.

The previous prime is 13391816369. The next prime is 13391816461. The reversal of 13391816381 is 18361819331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13383019225 + 8797156 = 115685^2 + 2966^2 .

It is a cyclic number.

It is not a de Polignac number, because 13391816381 - 2¹⁰ = 13391815357 is a prime.

It is a super-2 number, since 2×13391816381² (a number of 21 digits) 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 (13391816281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6695908190 + 6695908191.

It is an arithmetic number, because the mean of its divisors is an integer number (6695908191).

Almost surely, 2^13391816381 is an apocalyptic number.

It is an amenable number.

13391816381 is a deficient number, since it is larger than the sum of its proper divisors (1).

13391816381 is an equidigital number, since it uses as much as digits as its factorization.

13391816381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The spelling of 13391816381 in words is "thirteen billion, three hundred ninety-one million, eight hundred sixteen thousand, three hundred eighty-one".