9129415661 has 2 divisors, whose sum is σ = 9129415662. Its totient is φ = 9129415660.

The previous prime is 9129415651. The next prime is 9129415693. The reversal of 9129415661 is 1665149219.

9129415661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8894376100 + 235039561 = 94310^2 + 15331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9129415661 is a prime.

It is a super-2 number, since 2×9129415661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9129415601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4564707830 + 4564707831.

It is an arithmetic number, because the mean of its divisors is an integer number (4564707831).

Almost surely, 2^9129415661 is an apocalyptic number.

It is an amenable number.

9129415661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9129415661 is an equidigital number, since it uses as much as digits as its factorization.

9129415661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 44.

The square root of 9129415661 is about 95547.9757033083. The cubic root of 9129415661 is about 2090.0066131519.

The spelling of 9129415661 in words is "nine billion, one hundred twenty-nine million, four hundred fifteen thousand, six hundred sixty-one".