9900641 has 2 divisors, whose sum is σ = 9900642. Its totient is φ = 9900640.

The previous prime is 9900623. The next prime is 9900643. The reversal of 9900641 is 1460099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9740641 + 160000 = 3121^2 + 400^2 .

It is an emirp because it is prime and its reverse (1460099) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9900641 is a prime.

Together with 9900643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9900643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950320 + 4950321.

It is an arithmetic number, because the mean of its divisors is an integer number (4950321).

Almost surely, 2^9900641 is an apocalyptic number.

It is an amenable number.

9900641 is a deficient number, since it is larger than the sum of its proper divisors (1).

9900641 is an equidigital number, since it uses as much as digits as its factorization.

9900641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 9900641 is about 3146.5284044483. The cubic root of 9900641 is about 214.7275510574.

The spelling of 9900641 in words is "nine million, nine hundred thousand, six hundred forty-one".