8121915701 has 2 divisors, whose sum is σ = 8121915702. Its totient is φ = 8121915700.

The previous prime is 8121915691. The next prime is 8121915719. The reversal of 8121915701 is 1075191218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8033536900 + 88378801 = 89630^2 + 9401^2 .

It is a cyclic number.

It is not a de Polignac number, because 8121915701 - 2¹⁸ = 8121653557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8121915761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060957850 + 4060957851.

It is an arithmetic number, because the mean of its divisors is an integer number (4060957851).

Almost surely, 2^8121915701 is an apocalyptic number.

It is an amenable number.

8121915701 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121915701 is an equidigital number, since it uses as much as digits as its factorization.

8121915701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 35.

The square root of 8121915701 is about 90121.6716500532. The cubic root of 8121915701 is about 2010.1084651418.

The spelling of 8121915701 in words is "eight billion, one hundred twenty-one million, nine hundred fifteen thousand, seven hundred one".