261036009 has 12 divisors (see below), whose sum is σ = 406056196. Its totient is φ = 160637472.

The previous prime is 261035981. The next prime is 261036011. The reversal of 261036009 is 900630162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 36036009 + 225000000 = 6003^2 + 15000^2 .

It is not a de Polignac number, because 261036009 - 2⁵ = 261035977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261036509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1115422 + ... + 1115655.

Almost surely, 2^261036009 is an apocalyptic number.

It is an amenable number.

261036009 is a deficient number, since it is larger than the sum of its proper divisors (145020187).

261036009 is a wasteful number, since it uses less digits than its factorization.

261036009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231096 (or 2231093 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 261036009 is about 16156.6088335393. The cubic root of 261036009 is about 639.0970412549.

The spelling of 261036009 in words is "two hundred sixty-one million, thirty-six thousand, nine".