84942761261 has 2 divisors, whose sum is σ = 84942761262. Its totient is φ = 84942761260.

The previous prime is 84942761191. The next prime is 84942761273. The reversal of 84942761261 is 16216724948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51016805161 + 33925956100 = 225869^2 + 184190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84942761261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84942761161) 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 as a sum of consecutive naturals, namely, 42471380630 + 42471380631.

It is an arithmetic number, because the mean of its divisors is an integer number (42471380631).

Almost surely, 2^84942761261 is an apocalyptic number.

It is an amenable number.

84942761261 is a deficient number, since it is larger than the sum of its proper divisors (1).

84942761261 is an equidigital number, since it uses as much as digits as its factorization.

84942761261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 50.

The spelling of 84942761261 in words is "eighty-four billion, nine hundred forty-two million, seven hundred sixty-one thousand, two hundred sixty-one".