2001261533 has 8 divisors (see below), whose sum is σ = 2123668800. Its totient is φ = 1881803968.

The previous prime is 2001261529. The next prime is 2001261601. The reversal of 2001261533 is 3351621002.

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

It is a cyclic number.

It is not a de Polignac number, because 2001261533 - 2² = 2001261529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2001261499 and 2001261508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001261523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736028 + ... + 738741.

It is an arithmetic number, because the mean of its divisors is an integer number (265458600).

Almost surely, 2^2001261533 is an apocalyptic number.

2001261533 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2001261533 is a deficient number, since it is larger than the sum of its proper divisors (122407267).

2001261533 is a wasteful number, since it uses less digits than its factorization.

2001261533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474851.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 2001261533 is about 44735.4616942756. The cubic root of 2001261533 is about 1260.1858995469.

Adding to 2001261533 its reverse (3351621002), we get a palindrome (5352882535).

The spelling of 2001261533 in words is "two billion, one million, two hundred sixty-one thousand, five hundred thirty-three".