118145557 has 4 divisors (see below), whose sum is σ = 121956736. Its totient is φ = 114334380.

The previous prime is 118145543. The next prime is 118145561. The reversal of 118145557 is 755541811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 755541811 = 26879 ⋅28109.

It is a cyclic number.

It is not a de Polignac number, because 118145557 - 2¹⁹ = 117621269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118145567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1905543 + ... + 1905604.

It is an arithmetic number, because the mean of its divisors is an integer number (30489184).

Almost surely, 2^118145557 is an apocalyptic number.

It is an amenable number.

118145557 is a deficient number, since it is larger than the sum of its proper divisors (3811179).

118145557 is an equidigital number, since it uses as much as digits as its factorization.

118145557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3811178.

The product of its digits is 28000, while the sum is 37.

The square root of 118145557 is about 10869.4782303476. The cubic root of 118145557 is about 490.6884076541.

It can be divided in two parts, 11814 and 5557, that added together give a palindrome (17371).

The spelling of 118145557 in words is "one hundred eighteen million, one hundred forty-five thousand, five hundred fifty-seven".