118617881 has 2 divisors, whose sum is σ = 118617882. Its totient is φ = 118617880.

The previous prime is 118617841. The next prime is 118617883. The reversal of 118617881 is 188716811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77721856 + 40896025 = 8816^2 + 6395^2 .

It is an emirp because it is prime and its reverse (188716811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118617881 is a prime.

It is a super-2 number, since 2×118617881² = 28140403385860322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 118617883, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (118617883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59308940 + 59308941.

It is an arithmetic number, because the mean of its divisors is an integer number (59308941).

Almost surely, 2^118617881 is an apocalyptic number.

It is an amenable number.

118617881 is a deficient number, since it is larger than the sum of its proper divisors (1).

118617881 is an equidigital number, since it uses as much as digits as its factorization.

118617881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 41.

The square root of 118617881 is about 10891.1836363180. The cubic root of 118617881 is about 491.3414319172.

The spelling of 118617881 in words is "one hundred eighteen million, six hundred seventeen thousand, eight hundred eighty-one".