118203661 has 2 divisors, whose sum is σ = 118203662. Its totient is φ = 118203660.

The previous prime is 118203653. The next prime is 118203707. The reversal of 118203661 is 166302811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108784900 + 9418761 = 10430^2 + 3069^2 .

It is a cyclic number.

It is not a de Polignac number, because 118203661 - 2³ = 118203653 is a prime.

It is a Chen prime.

It is equal to p_6745231 and since 118203661 and 6745231 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118203061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59101830 + 59101831.

It is an arithmetic number, because the mean of its divisors is an integer number (59101831).

Almost surely, 2^118203661 is an apocalyptic number.

It is an amenable number.

118203661 is a deficient number, since it is larger than the sum of its proper divisors (1).

118203661 is an equidigital number, since it uses as much as digits as its factorization.

118203661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 118203661 is about 10872.1507071968. The cubic root of 118203661 is about 490.7688346780.

The spelling of 118203661 in words is "one hundred eighteen million, two hundred three thousand, six hundred sixty-one".