816451313 has 2 divisors, whose sum is σ = 816451314. Its totient is φ = 816451312.

The previous prime is 816451303. The next prime is 816451369. The reversal of 816451313 is 313154618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 467770384 + 348680929 = 21628^2 + 18673^2 .

It is a cyclic number.

It is not a de Polignac number, because 816451313 - 2¹⁰ = 816450289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816451313.

It is not a weakly prime, because it can be changed into another prime (816451303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408225656 + 408225657.

It is an arithmetic number, because the mean of its divisors is an integer number (408225657).

Almost surely, 2^816451313 is an apocalyptic number.

It is an amenable number.

816451313 is a deficient number, since it is larger than the sum of its proper divisors (1).

816451313 is an equidigital number, since it uses as much as digits as its factorization.

816451313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 816451313 is about 28573.6121797717. The cubic root of 816451313 is about 934.6379919176.

The spelling of 816451313 in words is "eight hundred sixteen million, four hundred fifty-one thousand, three hundred thirteen".