261067949 has 2 divisors, whose sum is σ = 261067950. Its totient is φ = 261067948.

The previous prime is 261067943. The next prime is 261067969. The reversal of 261067949 is 949760162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179292100 + 81775849 = 13390^2 + 9043^2 .

It is a cyclic number.

It is not a de Polignac number, because 261067949 - 2²⁰ = 260019373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261067943) 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, 130533974 + 130533975.

It is an arithmetic number, because the mean of its divisors is an integer number (130533975).

Almost surely, 2^261067949 is an apocalyptic number.

It is an amenable number.

261067949 is a deficient number, since it is larger than the sum of its proper divisors (1).

261067949 is an equidigital number, since it uses as much as digits as its factorization.

261067949 is an odious number, because the sum of its binary digits is odd.

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

The square root of 261067949 is about 16157.5972533047. The cubic root of 261067949 is about 639.1231065310.

The spelling of 261067949 in words is "two hundred sixty-one million, sixty-seven thousand, nine hundred forty-nine".