816251 has 2 divisors, whose sum is σ = 816252. Its totient is φ = 816250.

The previous prime is 816239. The next prime is 816271. The reversal of 816251 is 152618.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816251 is a prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (816271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408125 + 408126.

It is an arithmetic number, because the mean of its divisors is an integer number (408126).

2⁸¹⁶²⁵¹ is an apocalyptic number.

816251 is a deficient number, since it is larger than the sum of its proper divisors (1).

816251 is an equidigital number, since it uses as much as digits as its factorization.

816251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 816251 is about 903.4661034040. The cubic root of 816251 is about 93.4561549126.

Adding to 816251 its reverse (152618), we get a palindrome (968869).

The spelling of 816251 in words is "eight hundred sixteen thousand, two hundred fifty-one".