118891819 has 2 divisors, whose sum is σ = 118891820. Its totient is φ = 118891818.

The previous prime is 118891757. The next prime is 118891837. The reversal of 118891819 is 918198811.

It is a strong prime.

It is an emirp because it is prime and its reverse (918198811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118891819 - 2⁷ = 118891691 is a prime.

It is a super-2 number, since 2×118891819² = 28270529250257522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (118891849) 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, 59445909 + 59445910.

It is an arithmetic number, because the mean of its divisors is an integer number (59445910).

Almost surely, 2^118891819 is an apocalyptic number.

118891819 is a deficient number, since it is larger than the sum of its proper divisors (1).

118891819 is an equidigital number, since it uses as much as digits as its factorization.

118891819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 46.

The square root of 118891819 is about 10903.7525192018. The cubic root of 118891819 is about 491.7193783315.

The spelling of 118891819 in words is "one hundred eighteen million, eight hundred ninety-one thousand, eight hundred nineteen".