981001 has 4 divisors (see below), whose sum is σ = 1121152. Its totient is φ = 840852.

The previous prime is 980999. The next prime is 981011. The reversal of 981001 is 100189.

981001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 981001 - 2¹ = 980999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 981001.

It is not an unprimeable number, because it can be changed into a prime (981011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70065 + ... + 70078.

It is an arithmetic number, because the mean of its divisors is an integer number (280288).

2⁹⁸¹⁰⁰¹ is an apocalyptic number.

It is an amenable number.

981001 is a deficient number, since it is larger than the sum of its proper divisors (140151).

981001 is a wasteful number, since it uses less digits than its factorization.

981001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140150.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 981001 is about 990.4549459718. The cubic root of 981001 is about 99.3626464345.

The spelling of 981001 in words is "nine hundred eighty-one thousand, one".