261765041 has 4 divisors (see below), whose sum is σ = 261932400. Its totient is φ = 261597684.

The previous prime is 261765017. The next prime is 261765113. The reversal of 261765041 is 140567162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261765041 - 2⁶ = 261764977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261764989 and 261765007.

It is not an unprimeable number, because it can be changed into a prime (261765011) 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 in 3 ways as a sum of consecutive naturals, for example, 81311 + ... + 84468.

It is an arithmetic number, because the mean of its divisors is an integer number (65483100).

Almost surely, 2^261765041 is an apocalyptic number.

It is an amenable number.

261765041 is a deficient number, since it is larger than the sum of its proper divisors (167359).

261765041 is a wasteful number, since it uses less digits than its factorization.

261765041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167358.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 261765041 is about 16179.1545205551. The cubic root of 261765041 is about 639.6914536489.

The spelling of 261765041 in words is "two hundred sixty-one million, seven hundred sixty-five thousand, forty-one".