2001535497 has 24 divisors (see below), whose sum is σ = 3119190984. Its totient is φ = 1229462784.

The previous prime is 2001535451. The next prime is 2001535559. The reversal of 2001535497 is 7945351002.

2001535497 is a `hidden beast` number, since 200 + 15 + 354 + 97 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 69405561 + 1932129936 = 8331^2 + 43956^2 .

It is not a de Polignac number, because 2001535497 - 2¹⁵ = 2001502729 is a prime.

It is a super-2 number, since 2×2001535497² = 8012288691502074018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2001535397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49813 + ... + 80525.

It is an arithmetic number, because the mean of its divisors is an integer number (129966291).

Almost surely, 2^2001535497 is an apocalyptic number.

It is an amenable number.

2001535497 is a deficient number, since it is larger than the sum of its proper divisors (1117655487).

2001535497 is a wasteful number, since it uses less digits than its factorization.

2001535497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31289 (or 31286 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 2001535497 is about 44738.5236345591. The cubic root of 2001535497 is about 1260.2434015793.

Adding to 2001535497 its reverse (7945351002), we get a palindrome (9946886499).

The spelling of 2001535497 in words is "two billion, one million, five hundred thirty-five thousand, four hundred ninety-seven".