118281661 has 2 divisors, whose sum is σ = 118281662. Its totient is φ = 118281660.

The previous prime is 118281659. The next prime is 118281671. The reversal of 118281661 is 166182811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68790436 + 49491225 = 8294^2 + 7035^2 .

It is a cyclic number.

It is not a de Polignac number, because 118281661 - 2¹ = 118281659 is a prime.

Together with 118281659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118281601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59140830 + 59140831.

It is an arithmetic number, because the mean of its divisors is an integer number (59140831).

Almost surely, 2^118281661 is an apocalyptic number.

It is an amenable number.

118281661 is a deficient number, since it is larger than the sum of its proper divisors (1).

118281661 is an equidigital number, since it uses as much as digits as its factorization.

118281661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 34.

The square root of 118281661 is about 10875.7372623653. The cubic root of 118281661 is about 490.8767601344.

The spelling of 118281661 in words is "one hundred eighteen million, two hundred eighty-one thousand, six hundred sixty-one".