2001255161 has 8 divisors (see below), whose sum is σ = 2142290400. Its totient is φ = 1863790560.

The previous prime is 2001255119. The next prime is 2001255173. The reversal of 2001255161 is 1615521002.

It is a happy number.

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

It is not a de Polignac number, because 2001255161 - 2¹⁰ = 2001254137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001255101) 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, 891500 + ... + 893741.

It is an arithmetic number, because the mean of its divisors is an integer number (267786300).

Almost surely, 2^2001255161 is an apocalyptic number.

It is an amenable number.

2001255161 is a deficient number, since it is larger than the sum of its proper divisors (141035239).

2001255161 is a wasteful number, since it uses less digits than its factorization.

2001255161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785319.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 2001255161 is about 44735.3904755508. The cubic root of 2001255161 is about 1260.1845620717.

Adding to 2001255161 its reverse (1615521002), we get a palindrome (3616776163).

The spelling of 2001255161 in words is "two billion, one million, two hundred fifty-five thousand, one hundred sixty-one".