118531861 has 16 divisors (see below), whose sum is σ = 146079360. Its totient is φ = 93899520.

The previous prime is 118531843. The next prime is 118531867. The reversal of 118531861 is 168135811.

It is not a de Polignac number, because 118531861 - 2¹¹ = 118529813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118531867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5416 + ... + 16321.

It is an arithmetic number, because the mean of its divisors is an integer number (9129960).

Almost surely, 2^118531861 is an apocalyptic number.

It is an amenable number.

118531861 is a deficient number, since it is larger than the sum of its proper divisors (27547499).

118531861 is a wasteful number, since it uses less digits than its factorization.

118531861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21804.

The product of its digits is 5760, while the sum is 34.

The square root of 118531861 is about 10887.2338543819. The cubic root of 118531861 is about 491.2226319228. Note that the first 3 decimals are identical.

The spelling of 118531861 in words is "one hundred eighteen million, five hundred thirty-one thousand, eight hundred sixty-one".