51216287 has 2 divisors, whose sum is σ = 51216288. Its totient is φ = 51216286.

The previous prime is 51216283. The next prime is 51216293. The reversal of 51216287 is 78261215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51216287 - 2² = 51216283 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51216283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25608143 + 25608144.

It is an arithmetic number, because the mean of its divisors is an integer number (25608144).

Almost surely, 2^51216287 is an apocalyptic number.

51216287 is a deficient number, since it is larger than the sum of its proper divisors (1).

51216287 is an equidigital number, since it uses as much as digits as its factorization.

51216287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 51216287 is about 7156.5555262291. Note that the first 4 decimals coincide. The cubic root of 51216287 is about 371.3664762425.

The spelling of 51216287 in words is "fifty-one million, two hundred sixteen thousand, two hundred eighty-seven".