215245133 has 4 divisors (see below), whose sum is σ = 215832000. Its totient is φ = 214658268.

The previous prime is 215245123. The next prime is 215245139. The reversal of 215245133 is 331542512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215245133 - 2¹⁰ = 215244109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215245139) 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, 292883 + ... + 293616.

It is an arithmetic number, because the mean of its divisors is an integer number (53958000).

Almost surely, 2^215245133 is an apocalyptic number.

It is an amenable number.

215245133 is a deficient number, since it is larger than the sum of its proper divisors (586867).

215245133 is an equidigital number, since it uses as much as digits as its factorization.

215245133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586866.

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

The square root of 215245133 is about 14671.2348832673. The cubic root of 215245133 is about 599.3002332689.

Adding to 215245133 its reverse (331542512), we get a palindrome (546787645).

The spelling of 215245133 in words is "two hundred fifteen million, two hundred forty-five thousand, one hundred thirty-three".