13821787493 has 2 divisors, whose sum is σ = 13821787494. Its totient is φ = 13821787492.

The previous prime is 13821787489. The next prime is 13821787523. The reversal of 13821787493 is 39478712831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13349029444 + 472758049 = 115538^2 + 21743^2 .

It is a cyclic number.

It is not a de Polignac number, because 13821787493 - 2² = 13821787489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13821787393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6910893746 + 6910893747.

It is an arithmetic number, because the mean of its divisors is an integer number (6910893747).

Almost surely, 2^13821787493 is an apocalyptic number.

It is an amenable number.

13821787493 is a deficient number, since it is larger than the sum of its proper divisors (1).

13821787493 is an equidigital number, since it uses as much as digits as its factorization.

13821787493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 53.

The spelling of 13821787493 in words is "thirteen billion, eight hundred twenty-one million, seven hundred eighty-seven thousand, four hundred ninety-three".