118145561 has 2 divisors, whose sum is σ = 118145562. Its totient is φ = 118145560.

The previous prime is 118145543. The next prime is 118145567. The reversal of 118145561 is 165541811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112763161 + 5382400 = 10619^2 + 2320^2 .

It is a cyclic number.

It is not a de Polignac number, because 118145561 - 2¹⁸ = 117883417 is a prime.

It is not a weakly prime, because it can be changed into another prime (118145567) 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, 59072780 + 59072781.

It is an arithmetic number, because the mean of its divisors is an integer number (59072781).

Almost surely, 2^118145561 is an apocalyptic number.

It is an amenable number.

118145561 is a deficient number, since it is larger than the sum of its proper divisors (1).

118145561 is an equidigital number, since it uses as much as digits as its factorization.

118145561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 32.

The square root of 118145561 is about 10869.4784143491. The cubic root of 118145561 is about 490.6884131918.

The spelling of 118145561 in words is "one hundred eighteen million, one hundred forty-five thousand, five hundred sixty-one".