816969653 has 2 divisors, whose sum is σ = 816969654. Its totient is φ = 816969652.

The previous prime is 816969641. The next prime is 816969661. The reversal of 816969653 is 356969618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 744089284 + 72880369 = 27278^2 + 8537^2 .

It is a cyclic number.

It is not a de Polignac number, because 816969653 - 2⁸ = 816969397 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 816969595 and 816969604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816969623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408484826 + 408484827.

It is an arithmetic number, because the mean of its divisors is an integer number (408484827).

Almost surely, 2^816969653 is an apocalyptic number.

It is an amenable number.

816969653 is a deficient number, since it is larger than the sum of its proper divisors (1).

816969653 is an equidigital number, since it uses as much as digits as its factorization.

816969653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 53.

The square root of 816969653 is about 28582.6809974152. The cubic root of 816969653 is about 934.8357411127.

The spelling of 816969653 in words is "eight hundred sixteen million, nine hundred sixty-nine thousand, six hundred fifty-three".