215700145 has 12 divisors (see below), whose sum is σ = 261490140. Its totient is φ = 170811200.

The previous prime is 215700143. The next prime is 215700193. The reversal of 215700145 is 541007512.

It can be written as a sum of positive squares in 6 ways, for example, as 127509264 + 88190881 = 11292^2 + 9391^2 .

It is not a de Polignac number, because 215700145 - 2¹ = 215700143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215700143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48891 + ... + 53119.

It is an arithmetic number, because the mean of its divisors is an integer number (21790845).

Almost surely, 2^215700145 is an apocalyptic number.

It is an amenable number.

215700145 is a deficient number, since it is larger than the sum of its proper divisors (45789995).

215700145 is an equidigital number, since it uses as much as digits as its factorization.

215700145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4436 (or 4335 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 215700145 is about 14686.7336395810. The cubic root of 215700145 is about 599.7222279058.

Adding to 215700145 its reverse (541007512), we get a palindrome (756707657).

The spelling of 215700145 in words is "two hundred fifteen million, seven hundred thousand, one hundred forty-five".