120513661 has 2 divisors, whose sum is σ = 120513662. Its totient is φ = 120513660.

The previous prime is 120513641. The next prime is 120513667. The reversal of 120513661 is 166315021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77545636 + 42968025 = 8806^2 + 6555^2 .

It is a cyclic number.

It is not a de Polignac number, because 120513661 - 2¹¹ = 120511613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120513667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60256830 + 60256831.

It is an arithmetic number, because the mean of its divisors is an integer number (60256831).

Almost surely, 2^120513661 is an apocalyptic number.

It is an amenable number.

120513661 is a deficient number, since it is larger than the sum of its proper divisors (1).

120513661 is an equidigital number, since it uses as much as digits as its factorization.

120513661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 120513661 is about 10977.8714239146. The cubic root of 120513661 is about 493.9451891632.

Adding to 120513661 its reverse (166315021), we get a palindrome (286828682).

The spelling of 120513661 in words is "one hundred twenty million, five hundred thirteen thousand, six hundred sixty-one".