8127729749 has 2 divisors, whose sum is σ = 8127729750. Its totient is φ = 8127729748.

The previous prime is 8127729707. The next prime is 8127729803. The reversal of 8127729749 is 9479277218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4667349124 + 3460380625 = 68318^2 + 58825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8127729749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8127729694 and 8127729703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8127729149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4063864874 + 4063864875.

It is an arithmetic number, because the mean of its divisors is an integer number (4063864875).

Almost surely, 2^8127729749 is an apocalyptic number.

It is an amenable number.

8127729749 is a deficient number, since it is larger than the sum of its proper divisors (1).

8127729749 is an equidigital number, since it uses as much as digits as its factorization.

8127729749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 56.

The square root of 8127729749 is about 90153.9225380682. The cubic root of 8127729749 is about 2010.5879940268.

The spelling of 8127729749 in words is "eight billion, one hundred twenty-seven million, seven hundred twenty-nine thousand, seven hundred forty-nine".