8198253121 has 2 divisors, whose sum is σ = 8198253122. Its totient is φ = 8198253120.

The previous prime is 8198253109. The next prime is 8198253157. The reversal of 8198253121 is 1213528918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7619369521 + 578883600 = 87289^2 + 24060^2 .

It is a cyclic number.

It is not a de Polignac number, because 8198253121 - 2⁹ = 8198252609 is a prime.

It is a super-2 number, since 2×8198253121² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8198253181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4099126560 + 4099126561.

It is an arithmetic number, because the mean of its divisors is an integer number (4099126561).

Almost surely, 2^8198253121 is an apocalyptic number.

It is an amenable number.

8198253121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8198253121 is an equidigital number, since it uses as much as digits as its factorization.

8198253121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 40.

The square root of 8198253121 is about 90544.2053419212. The cubic root of 8198253121 is about 2016.3864685710.

The spelling of 8198253121 in words is "eight billion, one hundred ninety-eight million, two hundred fifty-three thousand, one hundred twenty-one".