118701991 has 2 divisors, whose sum is σ = 118701992. Its totient is φ = 118701990.

The previous prime is 118701977. The next prime is 118702027. The reversal of 118701991 is 199107811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 118701991 - 2¹⁷ = 118570919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 118701991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118701391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59350995 + 59350996.

It is an arithmetic number, because the mean of its divisors is an integer number (59350996).

Almost surely, 2^118701991 is an apocalyptic number.

118701991 is a deficient number, since it is larger than the sum of its proper divisors (1).

118701991 is an equidigital number, since it uses as much as digits as its factorization.

118701991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 37.

The square root of 118701991 is about 10895.0443321723. The cubic root of 118701991 is about 491.4575385371.

It can be divided in two parts, 11870 and 1991, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 118701991 in words is "one hundred eighteen million, seven hundred one thousand, nine hundred ninety-one".