2501001 has 6 divisors (see below), whose sum is σ = 3612570. Its totient is φ = 1667328.

The previous prime is 2500999. The next prime is 2501003. The reversal of 2501001 is 1001052.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2500999) and next prime (2501003).

It can be written as a sum of positive squares in only one way, i.e., 2250000 + 251001 = 1500^2 + 501^2 .

It is not a de Polignac number, because 2501001 - 2¹ = 2500999 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: 277889 = 2501001 / (2 + 5 + 0 + 1 + 0 + 0 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2501003) 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, 138936 + ... + 138953.

It is an arithmetic number, because the mean of its divisors is an integer number (602095).

2^2501001 is an apocalyptic number.

It is an amenable number.

2501001 is a deficient number, since it is larger than the sum of its proper divisors (1111569).

2501001 is a wasteful number, since it uses less digits than its factorization.

2501001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277895 (or 277892 counting only the distinct ones).

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

The square root of 2501001 is about 1581.4553423983. The cubic root of 2501001 is about 135.7389926262.

Adding to 2501001 its reverse (1001052), we get a palindrome (3502053).

The spelling of 2501001 in words is "two million, five hundred one thousand, one".