215042137 has 2 divisors, whose sum is σ = 215042138. Its totient is φ = 215042136.

The previous prime is 215042119. The next prime is 215042207. The reversal of 215042137 is 731240512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204518601 + 10523536 = 14301^2 + 3244^2 .

It is a cyclic number.

It is not a de Polignac number, because 215042137 - 2¹⁵ = 215009369 is a prime.

It is not a weakly prime, because it can be changed into another prime (215042117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107521068 + 107521069.

It is an arithmetic number, because the mean of its divisors is an integer number (107521069).

Almost surely, 2^215042137 is an apocalyptic number.

It is an amenable number.

215042137 is a deficient number, since it is larger than the sum of its proper divisors (1).

215042137 is an equidigital number, since it uses as much as digits as its factorization.

215042137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 215042137 is about 14664.3150879951. The cubic root of 215042137 is about 599.1117755592. Note that the first 3 decimals are identical.

Adding to 215042137 its reverse (731240512), we get a palindrome (946282649).

The spelling of 215042137 in words is "two hundred fifteen million, forty-two thousand, one hundred thirty-seven".