3891001 has 4 divisors (see below), whose sum is σ = 3902500. Its totient is φ = 3879504.

The previous prime is 3890981. The next prime is 3891037. The reversal of 3891001 is 1001983.

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 2027776 + 1863225 = 1424^2 + 1365^2 .

It is a cyclic number.

It is not a de Polignac number, because 3891001 - 2⁵ = 3890969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3891061) 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, 5226 + ... + 5923.

It is an arithmetic number, because the mean of its divisors is an integer number (975625).

Almost surely, 2^3891001 is an apocalyptic number.

It is an amenable number.

3891001 is a deficient number, since it is larger than the sum of its proper divisors (11499).

3891001 is a wasteful number, since it uses less digits than its factorization.

3891001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11498.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 3891001 is about 1972.5620395820. The cubic root of 3891001 is about 157.2849302691.

Adding to 3891001 its reverse (1001983), we get a palindrome (4892984).

The spelling of 3891001 in words is "three million, eight hundred ninety-one thousand, one".