215064251 has 2 divisors, whose sum is σ = 215064252. Its totient is φ = 215064250.

The previous prime is 215064247. The next prime is 215064253. The reversal of 215064251 is 152460512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215064251 - 2² = 215064247 is a prime.

Together with 215064253, it forms a pair of twin primes.

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 215064251.

It is not a weakly prime, because it can be changed into another prime (215064253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107532125 + 107532126.

It is an arithmetic number, because the mean of its divisors is an integer number (107532126).

Almost surely, 2^215064251 is an apocalyptic number.

215064251 is a deficient number, since it is larger than the sum of its proper divisors (1).

215064251 is an equidigital number, since it uses as much as digits as its factorization.

215064251 is an odious number, because the sum of its binary digits is odd.

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

The square root of 215064251 is about 14665.0690758687. The cubic root of 215064251 is about 599.1323115402.

The spelling of 215064251 in words is "two hundred fifteen million, sixty-four thousand, two hundred fifty-one".