261795069 has 6 divisors (see below), whose sum is σ = 378148446. Its totient is φ = 174530040.

The previous prime is 261795067. The next prime is 261795077. The reversal of 261795069 is 960597162.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 172265625 + 89529444 = 13125^2 + 9462^2 .

It is not a de Polignac number, because 261795069 - 2¹ = 261795067 is a prime.

It is a super-2 number, since 2×261795069² = 137073316305429522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261795067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14544162 + ... + 14544179.

It is an arithmetic number, because the mean of its divisors is an integer number (63024741).

Almost surely, 2^261795069 is an apocalyptic number.

It is an amenable number.

261795069 is a deficient number, since it is larger than the sum of its proper divisors (116353377).

261795069 is a wasteful number, since it uses less digits than its factorization.

261795069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29088347 (or 29088344 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 261795069 is about 16180.0824781581. The cubic root of 261795069 is about 639.7159131418.

The spelling of 261795069 in words is "two hundred sixty-one million, seven hundred ninety-five thousand, sixty-nine".