215042237 has 2 divisors, whose sum is σ = 215042238. Its totient is φ = 215042236.

The previous prime is 215042207. The next prime is 215042273. The reversal of 215042237 is 732240512.

215042237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (215042273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210424036 + 4618201 = 14506^2 + 2149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215042237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215042207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107521118 + 107521119.

It is an arithmetic number, because the mean of its divisors is an integer number (107521119).

Almost surely, 2^215042237 is an apocalyptic number.

It is an amenable number.

215042237 is a deficient number, since it is larger than the sum of its proper divisors (1).

215042237 is an equidigital number, since it uses as much as digits as its factorization.

215042237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 215042237 is about 14664.3184976323. The cubic root of 215042237 is about 599.1118684266. Note that the first 3 decimals are identical.

Adding to 215042237 its reverse (732240512), we get a palindrome (947282749).

The spelling of 215042237 in words is "two hundred fifteen million, forty-two thousand, two hundred thirty-seven".