118405551 has 16 divisors (see below), whose sum is σ = 175478400. Its totient is φ = 70405920.

The previous prime is 118405543. The next prime is 118405571. The reversal of 118405551 is 155504811.

It is not a de Polignac number, because 118405551 - 2³ = 118405543 is a prime.

It is a super-2 number, since 2×118405551² = 28039749015227202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118405571) 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 in 15 ways as a sum of consecutive naturals, for example, 32101 + ... + 35598.

It is an arithmetic number, because the mean of its divisors is an integer number (10967400).

Almost surely, 2^118405551 is an apocalyptic number.

118405551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

118405551 is a deficient number, since it is larger than the sum of its proper divisors (57072849).

118405551 is a wasteful number, since it uses less digits than its factorization.

118405551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67766.

The product of its (nonzero) digits is 4000, while the sum is 30.

The square root of 118405551 is about 10881.4314775217. The cubic root of 118405551 is about 491.0480842458.

It can be divided in two parts, 11840 and 5551, that added together give a triangular number (17391 = T₁₈₆).

The spelling of 118405551 in words is "one hundred eighteen million, four hundred five thousand, five hundred fifty-one".