8561492969 has 2 divisors, whose sum is σ = 8561492970. Its totient is φ = 8561492968.

The previous prime is 8561492939. The next prime is 8561492987. The reversal of 8561492969 is 9692941658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7467206569 + 1094286400 = 86413^2 + 33080^2 .

It is a cyclic number.

It is not a de Polignac number, because 8561492969 - 2⁸ = 8561492713 is a prime.

It is a super-2 number, since 2×8561492969² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (8561492909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4280746484 + 4280746485.

It is an arithmetic number, because the mean of its divisors is an integer number (4280746485).

Almost surely, 2^8561492969 is an apocalyptic number.

It is an amenable number.

8561492969 is a deficient number, since it is larger than the sum of its proper divisors (1).

8561492969 is an equidigital number, since it uses as much as digits as its factorization.

8561492969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8398080, while the sum is 59.

The square root of 8561492969 is about 92528.3360328067. The cubic root of 8561492969 is about 2045.7371635972.

The spelling of 8561492969 in words is "eight billion, five hundred sixty-one million, four hundred ninety-two thousand, nine hundred sixty-nine".