215133245 has 4 divisors (see below), whose sum is σ = 258159900. Its totient is φ = 172106592.

The previous prime is 215133227. The next prime is 215133251. The reversal of 215133245 is 542331512.

It is a happy number.

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 167288356 + 47844889 = 12934^2 + 6917^2 .

It is a cyclic number.

It is not a de Polignac number, because 215133245 - 2¹⁰ = 215132221 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21513320 + ... + 21513329.

It is an arithmetic number, because the mean of its divisors is an integer number (64539975).

Almost surely, 2^215133245 is an apocalyptic number.

It is an amenable number.

215133245 is a deficient number, since it is larger than the sum of its proper divisors (43026655).

215133245 is an equidigital number, since it uses as much as digits as its factorization.

215133245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43026654.

The product of its digits is 3600, while the sum is 26.

The square root of 215133245 is about 14667.4212116514. The cubic root of 215133245 is about 599.1963731946.

Adding to 215133245 its reverse (542331512), we get a palindrome (757464757).

The spelling of 215133245 in words is "two hundred fifteen million, one hundred thirty-three thousand, two hundred forty-five".