2001205261 has 8 divisors (see below), whose sum is σ = 2183946048. Its totient is φ = 1818600000.

The previous prime is 2001205259. The next prime is 2001205309. The reversal of 2001205261 is 1625021002.

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 2001205261 - 2¹ = 2001205259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001205211) 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, 1665 + ... + 63286.

It is an arithmetic number, because the mean of its divisors is an integer number (272993256).

Almost surely, 2^2001205261 is an apocalyptic number.

It is an amenable number.

2001205261 is a deficient number, since it is larger than the sum of its proper divisors (182740787).

2001205261 is a wasteful number, since it uses less digits than its factorization.

2001205261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67763.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2001205261 is about 44734.8327480946. The cubic root of 2001205261 is about 1260.1740880229.

Adding to 2001205261 its reverse (1625021002), we get a palindrome (3626226263).

The spelling of 2001205261 in words is "two billion, one million, two hundred five thousand, two hundred sixty-one".