215231143 has 4 divisors (see below), whose sum is σ = 216602200. Its totient is φ = 213860088.

The previous prime is 215231131. The next prime is 215231147. The reversal of 215231143 is 341132512.

It is a happy number.

215231143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 215231143 - 2¹³ = 215222951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215231147) 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, 685293 + ... + 685606.

It is an arithmetic number, because the mean of its divisors is an integer number (54150550).

Almost surely, 2^215231143 is an apocalyptic number.

215231143 is a deficient number, since it is larger than the sum of its proper divisors (1371057).

215231143 is a wasteful number, since it uses less digits than its factorization.

215231143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371056.

The product of its digits is 720, while the sum is 22.

The square root of 215231143 is about 14670.7580922051. The cubic root of 215231143 is about 599.2872490157.

Adding to 215231143 its reverse (341132512), we get a palindrome (556363655).

The spelling of 215231143 in words is "two hundred fifteen million, two hundred thirty-one thousand, one hundred forty-three".