215140145 has 16 divisors (see below), whose sum is σ = 284808960. Its totient is φ = 154704000.

The previous prime is 215140141. The next prime is 215140181. The reversal of 215140145 is 541041512.

215140145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215140145 - 2² = 215140141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215140145.

It is not an unprimeable number, because it can be changed into a prime (215140141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17081 + ... + 26870.

It is an arithmetic number, because the mean of its divisors is an integer number (17800560).

Almost surely, 2^215140145 is an apocalyptic number.

It is an amenable number.

215140145 is a deficient number, since it is larger than the sum of its proper divisors (69668815).

215140145 is a wasteful number, since it uses less digits than its factorization.

215140145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44056.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 215140145 is about 14667.6564249371. The cubic root of 215140145 is about 599.2027791637.

Adding to 215140145 its reverse (541041512), we get a palindrome (756181657).

The spelling of 215140145 in words is "two hundred fifteen million, one hundred forty thousand, one hundred forty-five".