261158567 has 2 divisors, whose sum is σ = 261158568. Its totient is φ = 261158566.

The previous prime is 261158549. The next prime is 261158581. The reversal of 261158567 is 765851162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261158567 - 2¹⁸ = 260896423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261158467) 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, 130579283 + 130579284.

It is an arithmetic number, because the mean of its divisors is an integer number (130579284).

Almost surely, 2^261158567 is an apocalyptic number.

261158567 is a deficient number, since it is larger than the sum of its proper divisors (1).

261158567 is an equidigital number, since it uses as much as digits as its factorization.

261158567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 41.

The square root of 261158567 is about 16160.4012017029. The cubic root of 261158567 is about 639.1970455933.

The spelling of 261158567 in words is "two hundred sixty-one million, one hundred fifty-eight thousand, five hundred sixty-seven".