215530245 has 48 divisors (see below), whose sum is σ = 434229120. Its totient is φ = 96849792.

The previous prime is 215530213. The next prime is 215530247. The reversal of 215530245 is 542035512.

It is a happy number.

215530245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215530245 - 2⁵ = 215530213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215530247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12787 + ... + 24383.

It is an arithmetic number, because the mean of its divisors is an integer number (9046440).

Almost surely, 2^215530245 is an apocalyptic number.

It is an amenable number.

215530245 is an abundant number, since it is smaller than the sum of its proper divisors (218698875).

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

215530245 is a wasteful number, since it uses less digits than its factorization.

215530245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11674 (or 11671 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 215530245 is about 14680.9483685489. The cubic root of 215530245 is about 599.5647259706.

Adding to 215530245 its reverse (542035512), we get a palindrome (757565757).

It can be divided in two parts, 2155 and 30245, that added together give a square (32400 = 180²).

The spelling of 215530245 in words is "two hundred fifteen million, five hundred thirty thousand, two hundred forty-five".