1002501001 has 4 divisors (see below), whose sum is σ = 1002601732. Its totient is φ = 1002400272.

The previous prime is 1002500959. The next prime is 1002501007. The reversal of 1002501001 is 1001052001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1001052001 = 28393 ⋅35257.

It can be written as a sum of positive squares in 2 ways, for example, as 658435600 + 344065401 = 25660^2 + 18549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002501001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002501007) 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, 33570 + ... + 55963.

It is an arithmetic number, because the mean of its divisors is an integer number (250650433).

Almost surely, 2^1002501001 is an apocalyptic number.

It is an amenable number.

1002501001 is a deficient number, since it is larger than the sum of its proper divisors (100731).

1002501001 is an equidigital number, since it uses as much as digits as its factorization.

1002501001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100730.

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

The square root of 1002501001 is about 31662.2962054239. The cubic root of 1002501001 is about 1000.8329729634.

Adding to 1002501001 its reverse (1001052001), we get a palindrome (2003553002).

The spelling of 1002501001 in words is "one billion, two million, five hundred one thousand, one".