901001 has 4 divisors (see below), whose sum is σ = 932100. Its totient is φ = 869904.

The previous prime is 900997. The next prime is 901007. The reversal of 901001 is 100109.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 491401 + 409600 = 701^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 901001 - 2² = 900997 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (901007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15506 + ... + 15563.

It is an arithmetic number, because the mean of its divisors is an integer number (233025).

2⁹⁰¹⁰⁰¹ is an apocalyptic number.

901001 is the 425-th centered decagonal number.

It is an amenable number.

901001 is a deficient number, since it is larger than the sum of its proper divisors (31099).

901001 is a wasteful number, since it uses less digits than its factorization.

901001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31098.

The product of its (nonzero) digits is 9, while the sum is 11.

The square root of 901001 is about 949.2107247603. The cubic root of 901001 is about 96.5847198232.

The spelling of 901001 in words is "nine hundred one thousand, one".