9921550297 has 2 divisors, whose sum is σ = 9921550298. Its totient is φ = 9921550296.

The previous prime is 9921550237. The next prime is 9921550343. The reversal of 9921550297 is 7920551299.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9884535241 + 37015056 = 99421^2 + 6084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9921550297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9921550297.

It is not a weakly prime, because it can be changed into another prime (9921550237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960775148 + 4960775149.

It is an arithmetic number, because the mean of its divisors is an integer number (4960775149).

Almost surely, 2^9921550297 is an apocalyptic number.

It is an amenable number.

9921550297 is a deficient number, since it is larger than the sum of its proper divisors (1).

9921550297 is an equidigital number, since it uses as much as digits as its factorization.

9921550297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 510300, while the sum is 49.

The square root of 9921550297 is about 99606.9791580891. The cubic root of 9921550297 is about 2148.7860677025.

The spelling of 9921550297 in words is "nine billion, nine hundred twenty-one million, five hundred fifty thousand, two hundred ninety-seven".