215316533 has 2 divisors, whose sum is σ = 215316534. Its totient is φ = 215316532.

The previous prime is 215316467. The next prime is 215316539. The reversal of 215316533 is 335613512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168558289 + 46758244 = 12983^2 + 6838^2 .

It is a cyclic number.

It is not a de Polignac number, because 215316533 - 2¹⁴ = 215300149 is a prime.

It is a super-2 number, since 2×215316533² = 92722418766280178, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 215316496 and 215316505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215316539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107658266 + 107658267.

It is an arithmetic number, because the mean of its divisors is an integer number (107658267).

Almost surely, 2^215316533 is an apocalyptic number.

It is an amenable number.

215316533 is a deficient number, since it is larger than the sum of its proper divisors (1).

215316533 is an equidigital number, since it uses as much as digits as its factorization.

215316533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 29.

The square root of 215316533 is about 14673.6680145082. The cubic root of 215316533 is about 599.3664915323.

The spelling of 215316533 in words is "two hundred fifteen million, three hundred sixteen thousand, five hundred thirty-three".