261347533 has 2 divisors, whose sum is σ = 261347534. Its totient is φ = 261347532.

The previous prime is 261347531. The next prime is 261347573. The reversal of 261347533 is 335743162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216148804 + 45198729 = 14702^2 + 6723^2 .

It is a cyclic number.

It is not a de Polignac number, because 261347533 - 2¹ = 261347531 is a prime.

Together with 261347531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261347531) 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, 130673766 + 130673767.

It is an arithmetic number, because the mean of its divisors is an integer number (130673767).

Almost surely, 2^261347533 is an apocalyptic number.

It is an amenable number.

261347533 is a deficient number, since it is larger than the sum of its proper divisors (1).

261347533 is an equidigital number, since it uses as much as digits as its factorization.

261347533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 34.

The square root of 261347533 is about 16166.2467196316. The cubic root of 261347533 is about 639.3511759486.

The spelling of 261347533 in words is "two hundred sixty-one million, three hundred forty-seven thousand, five hundred thirty-three".