8512811969 has 2 divisors, whose sum is σ = 8512811970. Its totient is φ = 8512811968.

The previous prime is 8512811959. The next prime is 8512811987. The reversal of 8512811969 is 9691182158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4480561969 + 4032250000 = 66937^2 + 63500^2 .

It is a cyclic number.

It is not a de Polignac number, because 8512811969 - 2¹² = 8512807873 is a prime.

It is a super-2 number, since 2×8512811969² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8512811939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4256405984 + 4256405985.

It is an arithmetic number, because the mean of its divisors is an integer number (4256405985).

Almost surely, 2^8512811969 is an apocalyptic number.

It is an amenable number.

8512811969 is a deficient number, since it is larger than the sum of its proper divisors (1).

8512811969 is an equidigital number, since it uses as much as digits as its factorization.

8512811969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 50.

The square root of 8512811969 is about 92264.9010675240. The cubic root of 8512811969 is about 2041.8524095177.

The spelling of 8512811969 in words is "eight billion, five hundred twelve million, eight hundred eleven thousand, nine hundred sixty-nine".