261562731577241 has 4 divisors (see below), whose sum is σ = 261563027903184. Its totient is φ = 261562435251300.

The previous prime is 261562731577207. The next prime is 261562731577271. The reversal of 261562731577241 is 142775137265162.

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 261562731577241 - 2¹⁸ = 261562731315097 is a prime.

It is a super-2 number, since 2×261562731577241² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261562731577271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146834975 + ... + 148605636.

It is an arithmetic number, because the mean of its divisors is an integer number (65390756975796).

Almost surely, 2^{261562731577241} is an apocalyptic number.

It is an amenable number.

261562731577241 is a deficient number, since it is larger than the sum of its proper divisors (296325943).

261562731577241 is an equidigital number, since it uses as much as digits as its factorization.

261562731577241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296325942.

The product of its digits is 29635200, while the sum is 59.

The spelling of 261562731577241 in words is "two hundred sixty-one trillion, five hundred sixty-two billion, seven hundred thirty-one million, five hundred seventy-seven thousand, two hundred forty-one".