118401691 has 4 divisors (see below), whose sum is σ = 118424800. Its totient is φ = 118378584.

The previous prime is 118401649. The next prime is 118401697. The reversal of 118401691 is 196104811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 118401691 - 2²³ = 110013083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118401697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51 + ... + 15388.

It is an arithmetic number, because the mean of its divisors is an integer number (29606200).

Almost surely, 2^118401691 is an apocalyptic number.

118401691 is a deficient number, since it is larger than the sum of its proper divisors (23109).

118401691 is an equidigital number, since it uses as much as digits as its factorization.

118401691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23108.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 118401691 is about 10881.2541097063. The cubic root of 118401691 is about 491.0427481609.

It can be divided in two parts, 11840 and 1691, that added together give a palindrome (13531).

The spelling of 118401691 in words is "one hundred eighteen million, four hundred one thousand, six hundred ninety-one".