900001 has 2 divisors, whose sum is σ = 900002. Its totient is φ = 900000.

The previous prime is 899981. The next prime is 900007. The reversal of 900001 is 100009.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 853776 + 46225 = 924^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 900001 - 2¹³ = 891809 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (900007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450000 + 450001.

It is an arithmetic number, because the mean of its divisors is an integer number (450001).

2⁹⁰⁰⁰⁰¹ is an apocalyptic number.

It is an amenable number.

900001 is a deficient number, since it is larger than the sum of its proper divisors (1).

900001 is an equidigital number, since it uses as much as digits as its factorization.

900001 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 10.

The square root of 900001 is about 948.6838250966. The cubic root of 900001 is about 96.5489742194.

The spelling of 900001 in words is "nine hundred thousand, one".