201001023001 has 4 divisors (see below), whose sum is σ = 202281284452. Its totient is φ = 199720761552.

The previous prime is 201001022993. The next prime is 201001023019. The reversal of 201001023001 is 100320100102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26424128025 + 174576894976 = 162555^2 + 417824^2 .

It is a cyclic number.

It is not a de Polignac number, because 201001023001 - 2³ = 201001022993 is a prime.

It is a super-2 number, since 2×201001023001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201001023061) 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, 640130490 + ... + 640130803.

It is an arithmetic number, because the mean of its divisors is an integer number (50570321113).

Almost surely, 2^201001023001 is an apocalyptic number.

It is an amenable number.

201001023001 is a deficient number, since it is larger than the sum of its proper divisors (1280261451).

201001023001 is a wasteful number, since it uses less digits than its factorization.

201001023001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280261450.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 201001023001 its reverse (100320100102), we get a palindrome (301321123103).

The spelling of 201001023001 in words is "two hundred one billion, one million, twenty-three thousand, one".