9901553 has 2 divisors, whose sum is σ = 9901554. Its totient is φ = 9901552.

The previous prime is 9901547. The next prime is 9901561. The reversal of 9901553 is 3551099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9878449 + 23104 = 3143^2 + 152^2 .

It is an emirp because it is prime and its reverse (3551099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9901553 - 2¹⁰ = 9900529 is a prime.

It is not a weakly prime, because it can be changed into another prime (9901543) 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, 4950776 + 4950777.

It is an arithmetic number, because the mean of its divisors is an integer number (4950777).

Almost surely, 2^9901553 is an apocalyptic number.

It is an amenable number.

9901553 is a deficient number, since it is larger than the sum of its proper divisors (1).

9901553 is an equidigital number, since it uses as much as digits as its factorization.

9901553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 9901553 is about 3146.6733227331. The cubic root of 9901553 is about 214.7341440822.

The spelling of 9901553 in words is "nine million, nine hundred one thousand, five hundred fifty-three".