6881312731157 has 2 divisors, whose sum is σ = 6881312731158. Its totient is φ = 6881312731156.

The previous prime is 6881312731123. The next prime is 6881312731201. The reversal of 6881312731157 is 7511372131886.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6256771833316 + 624540897841 = 2501354^2 + 790279^2 .

It is a cyclic number.

It is not a de Polignac number, because 6881312731157 - 2¹⁰ = 6881312730133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6881312731099 and 6881312731108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6881312730157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3440656365578 + 3440656365579.

It is an arithmetic number, because the mean of its divisors is an integer number (3440656365579).

Almost surely, 2^{6881312731157} is an apocalyptic number.

It is an amenable number.

6881312731157 is a deficient number, since it is larger than the sum of its proper divisors (1).

6881312731157 is an equidigital number, since it uses as much as digits as its factorization.

6881312731157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 53.

The spelling of 6881312731157 in words is "six trillion, eight hundred eighty-one billion, three hundred twelve million, seven hundred thirty-one thousand, one hundred fifty-seven".