118106561 has 2 divisors, whose sum is σ = 118106562. Its totient is φ = 118106560.

The previous prime is 118106539. The next prime is 118106567. The reversal of 118106561 is 165601811.

118106561 is nontrivially palindromic in base 9.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85673536 + 32433025 = 9256^2 + 5695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118106561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (118106567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59053280 + 59053281.

It is an arithmetic number, because the mean of its divisors is an integer number (59053281).

Almost surely, 2^118106561 is an apocalyptic number.

It is an amenable number.

118106561 is a deficient number, since it is larger than the sum of its proper divisors (1).

118106561 is an equidigital number, since it uses as much as digits as its factorization.

118106561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 118106561 is about 10867.6842519462. The cubic root of 118106561 is about 490.6344149599.

The spelling of 118106561 in words is "one hundred eighteen million, one hundred six thousand, five hundred sixty-one".