90661001 has 2 divisors, whose sum is σ = 90661002. Its totient is φ = 90661000.

The previous prime is 90660991. The next prime is 90661033. The reversal of 90661001 is 10016609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86862400 + 3798601 = 9320^2 + 1949^2 .

It is a cyclic number.

It is not a de Polignac number, because 90661001 - 2⁶ = 90660937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90661061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45330500 + 45330501.

It is an arithmetic number, because the mean of its divisors is an integer number (45330501).

Almost surely, 2^90661001 is an apocalyptic number.

It is an amenable number.

90661001 is a deficient number, since it is larger than the sum of its proper divisors (1).

90661001 is an equidigital number, since it uses as much as digits as its factorization.

90661001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 90661001 is about 9521.6070597352. The cubic root of 90661001 is about 449.2349155880.

The spelling of 90661001 in words is "ninety million, six hundred sixty-one thousand, one".