215025245 has 4 divisors (see below), whose sum is σ = 258030300. Its totient is φ = 172020192.

The previous prime is 215025233. The next prime is 215025253. The reversal of 215025245 is 542520512.

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 117983044 + 97042201 = 10862^2 + 9851^2 .

It is a cyclic number.

It is not a de Polignac number, because 215025245 - 2⁸ = 215024989 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 21502520 + ... + 21502529.

It is an arithmetic number, because the mean of its divisors is an integer number (64507575).

Almost surely, 2^215025245 is an apocalyptic number.

It is an amenable number.

215025245 is a deficient number, since it is larger than the sum of its proper divisors (43005055).

215025245 is an equidigital number, since it uses as much as digits as its factorization.

215025245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43005054.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 215025245 is about 14663.7391207018. The cubic root of 215025245 is about 599.0960879964.

Adding to 215025245 its reverse (542520512), we get a palindrome (757545757).

The spelling of 215025245 in words is "two hundred fifteen million, twenty-five thousand, two hundred forty-five".