9821902001 has 2 divisors, whose sum is σ = 9821902002. Its totient is φ = 9821902000.

The previous prime is 9821901983. The next prime is 9821902073. The reversal of 9821902001 is 1002091289.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5104959601 + 4716942400 = 71449^2 + 68680^2 .

It is an emirp because it is prime and its reverse (1002091289) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9821902001 is a prime.

It is not a weakly prime, because it can be changed into another prime (9821902501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4910951000 + 4910951001.

It is an arithmetic number, because the mean of its divisors is an integer number (4910951001).

Almost surely, 2^9821902001 is an apocalyptic number.

It is an amenable number.

9821902001 is a deficient number, since it is larger than the sum of its proper divisors (1).

9821902001 is an equidigital number, since it uses as much as digits as its factorization.

9821902001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 9821902001 is about 99105.5094381740. The cubic root of 9821902001 is about 2141.5679836018.

The spelling of 9821902001 in words is "nine billion, eight hundred twenty-one million, nine hundred two thousand, one".