215231563 has 4 divisors (see below), whose sum is σ = 226559560. Its totient is φ = 203903568.

The previous prime is 215231507. The next prime is 215231567. The reversal of 215231563 is 365132512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215231563 - 2²⁵ = 181677131 is a prime.

It is a super-2 number, since 2×215231563² = 92649251422845938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215231567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5663970 + ... + 5664007.

It is an arithmetic number, because the mean of its divisors is an integer number (56639890).

Almost surely, 2^215231563 is an apocalyptic number.

215231563 is a deficient number, since it is larger than the sum of its proper divisors (11327997).

215231563 is a wasteful number, since it uses less digits than its factorization.

215231563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11327996.

The product of its digits is 5400, while the sum is 28.

The square root of 215231563 is about 14670.7724063868. The cubic root of 215231563 is about 599.2876388299.

The spelling of 215231563 in words is "two hundred fifteen million, two hundred thirty-one thousand, five hundred sixty-three".