9961471969 has 2 divisors, whose sum is σ = 9961471970. Its totient is φ = 9961471968.

The previous prime is 9961471951. The next prime is 9961471973. The reversal of 9961471969 is 9691741699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7445446369 + 2516025600 = 86287^2 + 50160^2 .

It is a cyclic number.

It is not a de Polignac number, because 9961471969 - 2⁵ = 9961471937 is a prime.

It is a super-2 number, since 2×9961471969² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9961471909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980735984 + 4980735985.

It is an arithmetic number, because the mean of its divisors is an integer number (4980735985).

Almost surely, 2^9961471969 is an apocalyptic number.

It is an amenable number.

9961471969 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961471969 is an equidigital number, since it uses as much as digits as its factorization.

9961471969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6613488, while the sum is 61.

The square root of 9961471969 is about 99807.1739355443. The cubic root of 9961471969 is about 2151.6642581194.

The spelling of 9961471969 in words is "nine billion, nine hundred sixty-one million, four hundred seventy-one thousand, nine hundred sixty-nine".