261140771 has 4 divisors (see below), whose sum is σ = 263134344. Its totient is φ = 259147200.

The previous prime is 261140753. The next prime is 261140777. The reversal of 261140771 is 177041162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261140771 - 2⁶ = 261140707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261140777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996590 + ... + 996851.

It is an arithmetic number, because the mean of its divisors is an integer number (65783586).

Almost surely, 2^261140771 is an apocalyptic number.

261140771 is a deficient number, since it is larger than the sum of its proper divisors (1993573).

261140771 is a wasteful number, since it uses less digits than its factorization.

261140771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993572.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 261140771 is about 16159.8505871806. The cubic root of 261140771 is about 639.1825264333.

The spelling of 261140771 in words is "two hundred sixty-one million, one hundred forty thousand, seven hundred seventy-one".