216253537 has 2 divisors, whose sum is σ = 216253538. Its totient is φ = 216253536.

The previous prime is 216253519. The next prime is 216253553. The reversal of 216253537 is 735352612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123632161 + 92621376 = 11119^2 + 9624^2 .

It is a cyclic number.

It is not a de Polignac number, because 216253537 - 2¹¹ = 216251489 is a prime.

It is not a weakly prime, because it can be changed into another prime (216253517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108126768 + 108126769.

It is an arithmetic number, because the mean of its divisors is an integer number (108126769).

Almost surely, 2^216253537 is an apocalyptic number.

It is an amenable number.

216253537 is a deficient number, since it is larger than the sum of its proper divisors (1).

216253537 is an equidigital number, since it uses as much as digits as its factorization.

216253537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 34.

The square root of 216253537 is about 14705.5614309689. The cubic root of 216253537 is about 600.2346646903.

The spelling of 216253537 in words is "two hundred sixteen million, two hundred fifty-three thousand, five hundred thirty-seven".