261334889 has 2 divisors, whose sum is σ = 261334890. Its totient is φ = 261334888.

The previous prime is 261334841. The next prime is 261334961. The reversal of 261334889 is 988433162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196000000 + 65334889 = 14000^2 + 8083^2 .

It is a cyclic number.

It is not a de Polignac number, because 261334889 - 2¹² = 261330793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261304889) 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, 130667444 + 130667445.

It is an arithmetic number, because the mean of its divisors is an integer number (130667445).

Almost surely, 2^261334889 is an apocalyptic number.

It is an amenable number.

261334889 is a deficient number, since it is larger than the sum of its proper divisors (1).

261334889 is an equidigital number, since it uses as much as digits as its factorization.

261334889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 261334889 is about 16165.8556531970. The cubic root of 261334889 is about 639.3408651738.

The spelling of 261334889 in words is "two hundred sixty-one million, three hundred thirty-four thousand, eight hundred eighty-nine".