215863113 has 4 divisors (see below), whose sum is σ = 287817488. Its totient is φ = 143908740.

The previous prime is 215863099. The next prime is 215863133. The reversal of 215863113 is 311368512.

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 not a de Polignac number, because 215863113 - 2⁴ = 215863097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215863133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35977183 + ... + 35977188.

It is an arithmetic number, because the mean of its divisors is an integer number (71954372).

Almost surely, 2^215863113 is an apocalyptic number.

It is an amenable number.

215863113 is a deficient number, since it is larger than the sum of its proper divisors (71954375).

215863113 is an equidigital number, since it uses as much as digits as its factorization.

215863113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71954374.

The product of its digits is 4320, while the sum is 30.

The square root of 215863113 is about 14692.2807283281. The cubic root of 215863113 is about 599.8732259936.

The spelling of 215863113 in words is "two hundred fifteen million, eight hundred sixty-three thousand, one hundred thirteen".