261331140841 has 2 divisors, whose sum is σ = 261331140842. Its totient is φ = 261331140840.

The previous prime is 261331140839. The next prime is 261331140953. The reversal of 261331140841 is 148041133162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256881717225 + 4449423616 = 506835^2 + 66704^2 .

It is a cyclic number.

It is not a de Polignac number, because 261331140841 - 2¹ = 261331140839 is a prime.

Together with 261331140839, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 261331140797 and 261331140806.

It is not a weakly prime, because it can be changed into another prime (261331140041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130665570420 + 130665570421.

It is an arithmetic number, because the mean of its divisors is an integer number (130665570421).

Almost surely, 2^261331140841 is an apocalyptic number.

It is an amenable number.

261331140841 is a deficient number, since it is larger than the sum of its proper divisors (1).

261331140841 is an equidigital number, since it uses as much as digits as its factorization.

261331140841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 261331140841 in words is "two hundred sixty-one billion, three hundred thirty-one million, one hundred forty thousand, eight hundred forty-one".