202001001 has 16 divisors (see below), whose sum is σ = 276338496. Its totient is φ = 131210496.

The previous prime is 202000999. The next prime is 202001003. The reversal of 202001001 is 100100202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (202000999) and next prime (202001003).

It is not a de Polignac number, because 202001001 - 2¹ = 202000999 is a prime.

202001001 is a modest number, since divided by 1001 gives 202 as remainder.

It is not an unprimeable number, because it can be changed into a prime (202001003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12621 + ... + 23733.

It is an arithmetic number, because the mean of its divisors is an integer number (17271156).

Almost surely, 2^202001001 is an apocalyptic number.

It is an amenable number.

202001001 is a deficient number, since it is larger than the sum of its proper divisors (74337495).

202001001 is a wasteful number, since it uses less digits than its factorization.

202001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11272.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 202001001 is about 14212.7056185654. The cubic root of 202001001 is about 586.7474000393.

Adding to 202001001 its reverse (100100202), we get a palindrome (302101203).

The spelling of 202001001 in words is "two hundred two million, one thousand, one".