216751 has 2 divisors, whose sum is σ = 216752. Its totient is φ = 216750.

The previous prime is 216743. The next prime is 216757. The reversal of 216751 is 157612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216751 - 2³ = 216743 is a prime.

It is a Chen prime.

216751 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216757) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108375 + 108376.

It is an arithmetic number, because the mean of its divisors is an integer number (108376).

2²¹⁶⁷⁵¹ is an apocalyptic number.

216751 is a deficient number, since it is larger than the sum of its proper divisors (1).

216751 is an equidigital number, since it uses as much as digits as its factorization.

216751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 22.

The square root of 216751 is about 465.5652478440. The cubic root of 216751 is about 60.0694566024.

The spelling of 216751 in words is "two hundred sixteen thousand, seven hundred fifty-one".