2001023531 has 8 divisors (see below), whose sum is σ = 2155717200. Its totient is φ = 1846439712.

The previous prime is 2001023503. The next prime is 2001023537. The reversal of 2001023531 is 1353201002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2001023531 is a prime.

It is a super-2 number, since 2×2001023531² = 8008190343231415922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2001023537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12545 + ... + 64493.

It is an arithmetic number, because the mean of its divisors is an integer number (269464650).

Almost surely, 2^2001023531 is an apocalyptic number.

2001023531 is a deficient number, since it is larger than the sum of its proper divisors (154693669).

2001023531 is a wasteful number, since it uses less digits than its factorization.

2001023531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54925.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 2001023531 is about 44732.8015107482. The cubic root of 2001023531 is about 1260.1359412831.

Adding to 2001023531 its reverse (1353201002), we get a palindrome (3354224533).

The spelling of 2001023531 in words is "two billion, one million, twenty-three thousand, five hundred thirty-one".