9011001001 has 2 divisors, whose sum is σ = 9011001002. Its totient is φ = 9011001000.

The previous prime is 9011000989. The next prime is 9011001037. The reversal of 9011001001 is 1001001109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8450021776 + 560979225 = 91924^2 + 23685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9011001001 is a prime.

It is not a weakly prime, because it can be changed into another prime (9011001401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4505500500 + 4505500501.

It is an arithmetic number, because the mean of its divisors is an integer number (4505500501).

Almost surely, 2^9011001001 is an apocalyptic number.

It is an amenable number.

9011001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

9011001001 is an equidigital number, since it uses as much as digits as its factorization.

9011001001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9, while the sum is 13.

The square root of 9011001001 is about 94926.2924642061. The cubic root of 9011001001 is about 2080.9309966441.

The spelling of 9011001001 in words is "nine billion, eleven million, one thousand, one".