9781001 has 8 divisors (see below), whose sum is σ = 10609704. Its totient is φ = 8980480.

The previous prime is 9780989. The next prime is 9781007. The reversal of 9781001 is 1001879.

9781001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 15376 + 9765625 = 124^2 + 3125^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9781001 - 2¹⁰ = 9779977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9781007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6320 + ... + 7713.

It is an arithmetic number, because the mean of its divisors is an integer number (1326213).

Almost surely, 2^9781001 is an apocalyptic number.

It is an amenable number.

9781001 is a deficient number, since it is larger than the sum of its proper divisors (828703).

9781001 is a wasteful number, since it uses less digits than its factorization.

9781001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14091.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 9781001 is about 3127.4591923797. The cubic root of 9781001 is about 213.8591162272.

The spelling of 9781001 in words is "nine million, seven hundred eighty-one thousand, one".