261122087 has 2 divisors, whose sum is σ = 261122088. Its totient is φ = 261122086.

The previous prime is 261122047. The next prime is 261122107. The reversal of 261122087 is 780221162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261122087 - 2²⁰ = 260073511 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 (261122047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130561043 + 130561044.

It is an arithmetic number, because the mean of its divisors is an integer number (130561044).

Almost surely, 2^261122087 is an apocalyptic number.

261122087 is a deficient number, since it is larger than the sum of its proper divisors (1).

261122087 is an equidigital number, since it uses as much as digits as its factorization.

261122087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 261122087 is about 16159.2724774354. The cubic root of 261122087 is about 639.1672820741.

The spelling of 261122087 in words is "two hundred sixty-one million, one hundred twenty-two thousand, eighty-seven".