501002001 has 12 divisors (see below), whose sum is σ = 741320580. Its totient is φ = 325854720.

The previous prime is 501001979. The next prime is 501002003. The reversal of 501002001 is 100200105.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 230432400 + 270569601 = 15180^2 + 16449^2 .

It is not a de Polignac number, because 501002001 - 2¹⁰ = 501000977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (501002003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 678496 + ... + 679233.

It is an arithmetic number, because the mean of its divisors is an integer number (61776715).

Almost surely, 2^501002001 is an apocalyptic number.

It is an amenable number.

501002001 is a deficient number, since it is larger than the sum of its proper divisors (240318579).

501002001 is a wasteful number, since it uses less digits than its factorization.

501002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357776 (or 1357773 counting only the distinct ones).

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

The square root of 501002001 is about 22383.0739845983. The cubic root of 501002001 is about 794.2303646894.

Adding to 501002001 its reverse (100200105), we get a palindrome (601202106).

The spelling of 501002001 in words is "five hundred one million, two thousand, one".