9990215291 has 12 divisors (see below), whose sum is σ = 12128509008. Its totient is φ = 8059331712.

The previous prime is 9990215269. The next prime is 9990215299. The reversal of 9990215291 is 1925120999.

It is a de Polignac number, because none of the positive numbers 2^k-9990215291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9990215299) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2467136 + ... + 2471181.

It is an arithmetic number, because the mean of its divisors is an integer number (1010709084).

Almost surely, 2^9990215291 is an apocalyptic number.

9990215291 is a deficient number, since it is larger than the sum of its proper divisors (2138293717).

9990215291 is a wasteful number, since it uses less digits than its factorization.

9990215291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4938358 (or 4938341 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 47.

The square root of 9990215291 is about 99951.0644815752. The cubic root of 9990215291 is about 2153.7317768386.

The spelling of 9990215291 in words is "nine billion, nine hundred ninety million, two hundred fifteen thousand, two hundred ninety-one".