215561113 has 4 divisors (see below), whose sum is σ = 215593488. Its totient is φ = 215528740.

The previous prime is 215561111. The next prime is 215561119. The reversal of 215561113 is 311165512.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 215561113 - 2¹ = 215561111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215561111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2131 + ... + 20872.

It is an arithmetic number, because the mean of its divisors is an integer number (53898372).

Almost surely, 2^215561113 is an apocalyptic number.

It is an amenable number.

215561113 is a deficient number, since it is larger than the sum of its proper divisors (32375).

215561113 is an equidigital number, since it uses as much as digits as its factorization.

215561113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32374.

The product of its digits is 900, while the sum is 25.

The square root of 215561113 is about 14681.9996253916. Note that the first 3 decimals coincide. The cubic root of 215561113 is about 599.5933476001.

The spelling of 215561113 in words is "two hundred fifteen million, five hundred sixty-one thousand, one hundred thirteen".