215131116 has 12 divisors (see below), whose sum is σ = 501972632. Its totient is φ = 71710368.

The previous prime is 215131093. The next prime is 215131123. The reversal of 215131116 is 611131512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 215131092 and 215131101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8963785 + ... + 8963808.

Almost surely, 2^215131116 is an apocalyptic number.

It is an amenable number.

215131116 is an abundant number, since it is smaller than the sum of its proper divisors (286841516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215131116 is a wasteful number, since it uses less digits than its factorization.

215131116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17927600 (or 17927598 counting only the distinct ones).

The product of its digits is 180, while the sum is 21.

The square root of 215131116 is about 14667.3486356601. The cubic root of 215131116 is about 599.1943966005.

Adding to 215131116 its reverse (611131512), we get a palindrome (826262628).

The spelling of 215131116 in words is "two hundred fifteen million, one hundred thirty-one thousand, one hundred sixteen".