816133 has 2 divisors, whose sum is σ = 816134. Its totient is φ = 816132.

The previous prime is 816131. The next prime is 816157. The reversal of 816133 is 331618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521284 + 294849 = 722^2 + 543^2 .

It is a cyclic number.

It is not a de Polignac number, because 816133 - 2¹ = 816131 is a prime.

Together with 816131, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408066 + 408067.

It is an arithmetic number, because the mean of its divisors is an integer number (408067).

2⁸¹⁶¹³³ is an apocalyptic number.

It is an amenable number.

816133 is a deficient number, since it is larger than the sum of its proper divisors (1).

816133 is an equidigital number, since it uses as much as digits as its factorization.

816133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 816133 is about 903.4007969888. The cubic root of 816133 is about 93.4516512498.

It can be divided in two parts, 816 and 133, that added together give a palindrome (949).

The spelling of 816133 in words is "eight hundred sixteen thousand, one hundred thirty-three".