215011145 has 4 divisors (see below), whose sum is σ = 258013380. Its totient is φ = 172008912.

The previous prime is 215011141. The next prime is 215011151. The reversal of 215011145 is 541110512.

215011145 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 141514816 + 73496329 = 11896^2 + 8573^2 .

It is a cyclic number.

It is not a de Polignac number, because 215011145 - 2² = 215011141 is a prime.

It is a super-2 number, since 2×215011145² = 92459584948422050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215011141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21501110 + ... + 21501119.

It is an arithmetic number, because the mean of its divisors is an integer number (64503345).

Almost surely, 2^215011145 is an apocalyptic number.

It is an amenable number.

215011145 is a deficient number, since it is larger than the sum of its proper divisors (43002235).

215011145 is an equidigital number, since it uses as much as digits as its factorization.

215011145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43002234.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 215011145 is about 14663.2583350359. The cubic root of 215011145 is about 599.0829927286.

Adding to 215011145 its reverse (541110512), we get a palindrome (756121657).

The spelling of 215011145 in words is "two hundred fifteen million, eleven thousand, one hundred forty-five".