261122671 has 2 divisors, whose sum is σ = 261122672. Its totient is φ = 261122670.

The previous prime is 261122633. The next prime is 261122677. The reversal of 261122671 is 176221162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261122671 - 2¹⁵ = 261089903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261122677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130561335 + 130561336.

It is an arithmetic number, because the mean of its divisors is an integer number (130561336).

Almost surely, 2^261122671 is an apocalyptic number.

261122671 is a deficient number, since it is larger than the sum of its proper divisors (1).

261122671 is an equidigital number, since it uses as much as digits as its factorization.

261122671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 261122671 is about 16159.2905475457. The cubic root of 261122671 is about 639.1677585733.

The spelling of 261122671 in words is "two hundred sixty-one million, one hundred twenty-two thousand, six hundred seventy-one".