9901231 has 2 divisors, whose sum is σ = 9901232. Its totient is φ = 9901230.

The previous prime is 9901219. The next prime is 9901253. The reversal of 9901231 is 1321099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9901231 - 2⁷ = 9901103 is a prime.

It is a super-2 number, since 2×9901231² = 196068750630722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9901196 and 9901205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9901211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950615 + 4950616.

It is an arithmetic number, because the mean of its divisors is an integer number (4950616).

Almost surely, 2^9901231 is an apocalyptic number.

9901231 is a deficient number, since it is larger than the sum of its proper divisors (1).

9901231 is an equidigital number, since it uses as much as digits as its factorization.

9901231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 9901231 is about 3146.6221571711. The cubic root of 9901231 is about 214.7318163280.

The spelling of 9901231 in words is "nine million, nine hundred one thousand, two hundred thirty-one".