261572567 has 2 divisors, whose sum is σ = 261572568. Its totient is φ = 261572566.

The previous prime is 261572561. The next prime is 261572587. The reversal of 261572567 is 765275162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261572567 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261572561) 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 as a sum of consecutive naturals, namely, 130786283 + 130786284.

It is an arithmetic number, because the mean of its divisors is an integer number (130786284).

Almost surely, 2^261572567 is an apocalyptic number.

261572567 is a deficient number, since it is larger than the sum of its proper divisors (1).

261572567 is an equidigital number, since it uses as much as digits as its factorization.

261572567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176400, while the sum is 41.

The square root of 261572567 is about 16173.2052172722. The cubic root of 261572567 is about 639.5346283243.

The spelling of 261572567 in words is "two hundred sixty-one million, five hundred seventy-two thousand, five hundred sixty-seven".