261995333 has 2 divisors, whose sum is σ = 261995334. Its totient is φ = 261995332.

The previous prime is 261995329. The next prime is 261995387. The reversal of 261995333 is 333599162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182304004 + 79691329 = 13502^2 + 8927^2 .

It is a cyclic number.

It is not a de Polignac number, because 261995333 - 2² = 261995329 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261995633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130997666 + 130997667.

It is an arithmetic number, because the mean of its divisors is an integer number (130997667).

Almost surely, 2^261995333 is an apocalyptic number.

It is an amenable number.

261995333 is a deficient number, since it is larger than the sum of its proper divisors (1).

261995333 is an equidigital number, since it uses as much as digits as its factorization.

261995333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 41.

The square root of 261995333 is about 16186.2698914852. The cubic root of 261995333 is about 639.8789916074.

The spelling of 261995333 in words is "two hundred sixty-one million, nine hundred ninety-five thousand, three hundred thirty-three".