215242273 has 2 divisors, whose sum is σ = 215242274. Its totient is φ = 215242272.

The previous prime is 215242259. The next prime is 215242319. The reversal of 215242273 is 372242512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145636624 + 69605649 = 12068^2 + 8343^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215242273 is a prime.

It is not a weakly prime, because it can be changed into another prime (215242213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107621136 + 107621137.

It is an arithmetic number, because the mean of its divisors is an integer number (107621137).

Almost surely, 2^215242273 is an apocalyptic number.

It is an amenable number.

215242273 is a deficient number, since it is larger than the sum of its proper divisors (1).

215242273 is an equidigital number, since it uses as much as digits as its factorization.

215242273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 28.

The square root of 215242273 is about 14671.1374133024. The cubic root of 215242273 is about 599.2975789212.

Adding to 215242273 its reverse (372242512), we get a palindrome (587484785).

The spelling of 215242273 in words is "two hundred fifteen million, two hundred forty-two thousand, two hundred seventy-three".