9990846791 has 2 divisors, whose sum is σ = 9990846792. Its totient is φ = 9990846790.

The previous prime is 9990846731. The next prime is 9990846797. The reversal of 9990846791 is 1976480999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9990846791 - 2¹⁴ = 9990830407 is a prime.

It is a super-3 number, since 3×9990846791³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9990846797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995423395 + 4995423396.

It is an arithmetic number, because the mean of its divisors is an integer number (4995423396).

Almost surely, 2^9990846791 is an apocalyptic number.

9990846791 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990846791 is an equidigital number, since it uses as much as digits as its factorization.

9990846791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8817984, while the sum is 62.

The square root of 9990846791 is about 99954.2234775500. The cubic root of 9990846791 is about 2153.7771563398. Note that the first 3 decimals are identical.

The spelling of 9990846791 in words is "nine billion, nine hundred ninety million, eight hundred forty-six thousand, seven hundred ninety-one".