215135345 has 4 divisors (see below), whose sum is σ = 258162420. Its totient is φ = 172108272.

The previous prime is 215135341. The next prime is 215135351. The reversal of 215135345 is 543531512.

215135345 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 can be written as a sum of positive squares in 2 ways, for example, as 94926049 + 120209296 = 9743^2 + 10964^2 .

It is a cyclic number.

It is not a de Polignac number, because 215135345 - 2² = 215135341 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215135341) 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, 21513530 + ... + 21513539.

It is an arithmetic number, because the mean of its divisors is an integer number (64540605).

Almost surely, 2^215135345 is an apocalyptic number.

It is an amenable number.

215135345 is a deficient number, since it is larger than the sum of its proper divisors (43027075).

215135345 is an equidigital number, since it uses as much as digits as its factorization.

215135345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43027074.

The product of its digits is 9000, while the sum is 29.

The square root of 215135345 is about 14667.4927987029. The cubic root of 215135345 is about 599.1983228518.

Adding to 215135345 its reverse (543531512), we get a palindrome (758666857).

The spelling of 215135345 in words is "two hundred fifteen million, one hundred thirty-five thousand, three hundred forty-five".