2001501 has 6 divisors (see below), whose sum is σ = 2891070. Its totient is φ = 1334328.

The previous prime is 2001487. The next prime is 2001509. The reversal of 2001501 is 1051002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1512900 + 488601 = 1230^2 + 699^2 .

It is not a de Polignac number, because 2001501 - 2⁵ = 2001469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 222389 = 2001501 / (2 + 0 + 0 + 1 + 5 + 0 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001509) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111186 + ... + 111203.

It is an arithmetic number, because the mean of its divisors is an integer number (481845).

2^2001501 is an apocalyptic number.

It is an amenable number.

2001501 is a deficient number, since it is larger than the sum of its proper divisors (889569).

2001501 is a wasteful number, since it uses less digits than its factorization.

2001501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222395 (or 222392 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 2001501 is about 1414.7441464802. The cubic root of 2001501 is about 126.0236161327.

Adding to 2001501 its reverse (1051002), we get a palindrome (3052503).

The spelling of 2001501 in words is "two million, one thousand, five hundred one".