61117171109 has 2 divisors, whose sum is σ = 61117171110. Its totient is φ = 61117171108.

The previous prime is 61117171051. The next prime is 61117171133. The reversal of 61117171109 is 90117171116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59785140100 + 1332031009 = 244510^2 + 36497^2 .

It is a cyclic number.

It is not a de Polignac number, because 61117171109 - 2⁸ = 61117170853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61117173109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30558585554 + 30558585555.

It is an arithmetic number, because the mean of its divisors is an integer number (30558585555).

Almost surely, 2^61117171109 is an apocalyptic number.

It is an amenable number.

61117171109 is a deficient number, since it is larger than the sum of its proper divisors (1).

61117171109 is an equidigital number, since it uses as much as digits as its factorization.

61117171109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 35.

The spelling of 61117171109 in words is "sixty-one billion, one hundred seventeen million, one hundred seventy-one thousand, one hundred nine".