120115661 has 2 divisors, whose sum is σ = 120115662. Its totient is φ = 120115660.

The previous prime is 120115621. The next prime is 120115717. The reversal of 120115661 is 166511021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60918025 + 59197636 = 7805^2 + 7694^2 .

It is a cyclic number.

It is not a de Polignac number, because 120115661 - 2²⁶ = 53006797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120115621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60057830 + 60057831.

It is an arithmetic number, because the mean of its divisors is an integer number (60057831).

Almost surely, 2^120115661 is an apocalyptic number.

It is an amenable number.

120115661 is a deficient number, since it is larger than the sum of its proper divisors (1).

120115661 is an equidigital number, since it uses as much as digits as its factorization.

120115661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 120115661 is about 10959.7290568700. The cubic root of 120115661 is about 493.4008331773.

Adding to 120115661 its reverse (166511021), we get a palindrome (286626682).

The spelling of 120115661 in words is "one hundred twenty million, one hundred fifteen thousand, six hundred sixty-one".