261082294189 has 2 divisors, whose sum is σ = 261082294190. Its totient is φ = 261082294188.

The previous prime is 261082294133. The next prime is 261082294211. The reversal of 261082294189 is 981492280162.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157232075625 + 103850218564 = 396525^2 + 322258^2 .

It is a cyclic number.

It is not a de Polignac number, because 261082294189 - 2¹⁹ = 261081769901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261082294129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130541147094 + 130541147095.

It is an arithmetic number, because the mean of its divisors is an integer number (130541147095).

Almost surely, 2^261082294189 is an apocalyptic number.

It is an amenable number.

261082294189 is a deficient number, since it is larger than the sum of its proper divisors (1).

261082294189 is an equidigital number, since it uses as much as digits as its factorization.

261082294189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 261082294189 in words is "two hundred sixty-one billion, eighty-two million, two hundred ninety-four thousand, one hundred eighty-nine".