261699227 has 2 divisors, whose sum is σ = 261699228. Its totient is φ = 261699226.

The previous prime is 261699203. The next prime is 261699239. The reversal of 261699227 is 722996162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261699227 - 2¹⁴ = 261682843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261699287) 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, 130849613 + 130849614.

It is an arithmetic number, because the mean of its divisors is an integer number (130849614).

Almost surely, 2^261699227 is an apocalyptic number.

261699227 is a deficient number, since it is larger than the sum of its proper divisors (1).

261699227 is an equidigital number, since it uses as much as digits as its factorization.

261699227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The square root of 261699227 is about 16177.1204792448. The cubic root of 261699227 is about 639.6378379050.

The spelling of 261699227 in words is "two hundred sixty-one million, six hundred ninety-nine thousand, two hundred twenty-seven".