261050431441 has 4 divisors (see below), whose sum is σ = 261212274612. Its totient is φ = 260888588272.

The previous prime is 261050431423. The next prime is 261050431469. The reversal of 261050431441 is 144134050162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 144134050162 = 2 ⋅72067025081.

It can be written as a sum of positive squares in 2 ways, for example, as 222279246225 + 38771185216 = 471465^2 + 196904^2 .

It is a cyclic number.

It is not a de Polignac number, because 261050431441 - 2²¹ = 261048334289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261050431241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80919166 + ... + 80922391.

It is an arithmetic number, because the mean of its divisors is an integer number (65303068653).

Almost surely, 2^261050431441 is an apocalyptic number.

It is an amenable number.

261050431441 is a deficient number, since it is larger than the sum of its proper divisors (161843171).

261050431441 is a wasteful number, since it uses less digits than its factorization.

261050431441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161843170.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 261050431441 in words is "two hundred sixty-one billion, fifty million, four hundred thirty-one thousand, four hundred forty-one".