118421555 has 16 divisors (see below), whose sum is σ = 165162240. Its totient is φ = 79825632.

The previous prime is 118421543. The next prime is 118421561. The reversal of 118421555 is 555124811.

It is a cyclic number.

It is not a de Polignac number, because 118421555 - 2⁶ = 118421491 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26609 + ... + 30738.

It is an arithmetic number, because the mean of its divisors is an integer number (10322640).

Almost surely, 2^118421555 is an apocalyptic number.

118421555 is a deficient number, since it is larger than the sum of its proper divisors (46740685).

118421555 is an equidigital number, since it uses as much as digits as its factorization.

118421555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57418.

The product of its digits is 8000, while the sum is 32.

The square root of 118421555 is about 10882.1668338617. The cubic root of 118421555 is about 491.0702070247.

The spelling of 118421555 in words is "one hundred eighteen million, four hundred twenty-one thousand, five hundred fifty-five".