215573045 has 4 divisors (see below), whose sum is σ = 258687660. Its totient is φ = 172458432.

The previous prime is 215573023. The next prime is 215573077. The reversal of 215573045 is 540375512.

215573045 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 124523281 + 91049764 = 11159^2 + 9542^2 .

It is a cyclic number.

It is not a de Polignac number, because 215573045 - 2²⁰ = 214524469 is a prime.

It is a Curzon number.

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, 21557300 + ... + 21557309.

It is an arithmetic number, because the mean of its divisors is an integer number (64671915).

Almost surely, 2^215573045 is an apocalyptic number.

It is an amenable number.

215573045 is a deficient number, since it is larger than the sum of its proper divisors (43114615).

215573045 is an equidigital number, since it uses as much as digits as its factorization.

215573045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43114614.

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 215573045 is about 14682.4059676880. The cubic root of 215573045 is about 599.6044105352.

The spelling of 215573045 in words is "two hundred fifteen million, five hundred seventy-three thousand, forty-five".