216252251 has 2 divisors, whose sum is σ = 216252252. Its totient is φ = 216252250.

The previous prime is 216252229. The next prime is 216252277. The reversal of 216252251 is 152252612.

It is an a-pointer prime, because the next prime (216252277) can be obtained adding 216252251 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216252251 - 2¹⁰ = 216251227 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216252251.

It is not a weakly prime, because it can be changed into another prime (216252551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108126125 + 108126126.

It is an arithmetic number, because the mean of its divisors is an integer number (108126126).

Almost surely, 2^216252251 is an apocalyptic number.

216252251 is a deficient number, since it is larger than the sum of its proper divisors (1).

216252251 is an equidigital number, since it uses as much as digits as its factorization.

216252251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 26.

The square root of 216252251 is about 14705.5177059497. The cubic root of 216252251 is about 600.2334748781.

The spelling of 216252251 in words is "two hundred sixteen million, two hundred fifty-two thousand, two hundred fifty-one".