261067969 has 2 divisors, whose sum is σ = 261067970. Its totient is φ = 261067968.

The previous prime is 261067949. The next prime is 261067987. The reversal of 261067969 is 969760162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203490225 + 57577744 = 14265^2 + 7588^2 .

It is a cyclic number.

It is not a de Polignac number, because 261067969 - 2⁷ = 261067841 is a prime.

It is a super-2 number, since 2×261067969² = 136312968875569922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261067949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130533984 + 130533985.

It is an arithmetic number, because the mean of its divisors is an integer number (130533985).

Almost surely, 2^261067969 is an apocalyptic number.

It is an amenable number.

261067969 is a deficient number, since it is larger than the sum of its proper divisors (1).

261067969 is an equidigital number, since it uses as much as digits as its factorization.

261067969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 261067969 is about 16157.5978722086. The cubic root of 261067969 is about 639.1231228518.

The spelling of 261067969 in words is "two hundred sixty-one million, sixty-seven thousand, nine hundred sixty-nine".