8121914897 has 2 divisors, whose sum is σ = 8121914898. Its totient is φ = 8121914896.

The previous prime is 8121914887. The next prime is 8121914903. The reversal of 8121914897 is 7984191218.

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., 4629577681 + 3492337216 = 68041^2 + 59096^2 .

It is a cyclic number.

It is not a de Polignac number, because 8121914897 - 2¹⁴ = 8121898513 is a prime.

It is a super-2 number, since 2×8121914897² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8121914837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060957448 + 4060957449.

It is an arithmetic number, because the mean of its divisors is an integer number (4060957449).

Almost surely, 2^8121914897 is an apocalyptic number.

It is an amenable number.

8121914897 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121914897 is an equidigital number, since it uses as much as digits as its factorization.

8121914897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 50.

The square root of 8121914897 is about 90121.6671894168. The cubic root of 8121914897 is about 2010.1083988139.

The spelling of 8121914897 in words is "eight billion, one hundred twenty-one million, nine hundred fourteen thousand, eight hundred ninety-seven".