7811213687429 has 2 divisors, whose sum is σ = 7811213687430. Its totient is φ = 7811213687428.

The previous prime is 7811213687363. The next prime is 7811213687467. The reversal of 7811213687429 is 9247863121187.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5673471429025 + 2137742258404 = 2381905^2 + 1462102^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7811213687429 is a prime.

It is a super-2 number, since 2×7811213687429² (a number of 27 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 (7811213617429) 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, 3905606843714 + 3905606843715.

It is an arithmetic number, because the mean of its divisors is an integer number (3905606843715).

Almost surely, 2^{7811213687429} is an apocalyptic number.

It is an amenable number.

7811213687429 is a deficient number, since it is larger than the sum of its proper divisors (1).

7811213687429 is an equidigital number, since it uses as much as digits as its factorization.

7811213687429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8128512, while the sum is 59.

The spelling of 7811213687429 in words is "seven trillion, eight hundred eleven billion, two hundred thirteen million, six hundred eighty-seven thousand, four hundred twenty-nine".