215242345 has 4 divisors (see below), whose sum is σ = 258290820. Its totient is φ = 172193872.

The previous prime is 215242327. The next prime is 215242361. The reversal of 215242345 is 543242512.

215242345 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 47073321 + 168169024 = 6861^2 + 12968^2 .

It is a cyclic number.

It is not a de Polignac number, because 215242345 - 2⁷ = 215242217 is a prime.

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, 21524230 + ... + 21524239.

It is an arithmetic number, because the mean of its divisors is an integer number (64572705).

Almost surely, 2^215242345 is an apocalyptic number.

It is an amenable number.

215242345 is a deficient number, since it is larger than the sum of its proper divisors (43048475).

215242345 is an equidigital number, since it uses as much as digits as its factorization.

215242345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43048474.

The product of its digits is 9600, while the sum is 28.

The square root of 215242345 is about 14671.1398670996. The cubic root of 215242345 is about 599.2976457442.

Adding to 215242345 its reverse (543242512), we get a palindrome (758484857).

The spelling of 215242345 in words is "two hundred fifteen million, two hundred forty-two thousand, three hundred forty-five".