2001233261 has 2 divisors, whose sum is σ = 2001233262. Its totient is φ = 2001233260.

The previous prime is 2001233233. The next prime is 2001233309. The reversal of 2001233261 is 1623321002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1935120100 + 66113161 = 43990^2 + 8131^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001233261 - 2¹⁰ = 2001232237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001433261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000616630 + 1000616631.

It is an arithmetic number, because the mean of its divisors is an integer number (1000616631).

Almost surely, 2^2001233261 is an apocalyptic number.

It is an amenable number.

2001233261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001233261 is an equidigital number, since it uses as much as digits as its factorization.

2001233261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 2001233261 is about 44735.1457022328. The cubic root of 2001233261 is about 1260.1799652661.

Adding to 2001233261 its reverse (1623321002), we get a palindrome (3624554263).

The spelling of 2001233261 in words is "two billion, one million, two hundred thirty-three thousand, two hundred sixty-one".