215133137 has 2 divisors, whose sum is σ = 215133138. Its totient is φ = 215133136.

The previous prime is 215133103. The next prime is 215133151. The reversal of 215133137 is 731331512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154977601 + 60155536 = 12449^2 + 7756^2 .

It is a cyclic number.

It is not a de Polignac number, because 215133137 - 2⁶ = 215133073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215133167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107566568 + 107566569.

It is an arithmetic number, because the mean of its divisors is an integer number (107566569).

Almost surely, 2^215133137 is an apocalyptic number.

It is an amenable number.

215133137 is a deficient number, since it is larger than the sum of its proper divisors (1).

215133137 is an equidigital number, since it uses as much as digits as its factorization.

215133137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 26.

The square root of 215133137 is about 14667.4175300221. The cubic root of 215133137 is about 599.1962729261.

Adding to 215133137 its reverse (731331512), we get a palindrome (946464649).

The spelling of 215133137 in words is "two hundred fifteen million, one hundred thirty-three thousand, one hundred thirty-seven".