815783873 has 2 divisors, whose sum is σ = 815783874. Its totient is φ = 815783872.

The previous prime is 815783869. The next prime is 815783923. The reversal of 815783873 is 378387518.

It is an a-pointer prime, because the next prime (815783923) can be obtained adding 815783873 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 737231104 + 78552769 = 27152^2 + 8863^2 .

It is a cyclic number.

It is not a de Polignac number, because 815783873 - 2² = 815783869 is a prime.

It is not a weakly prime, because it can be changed into another prime (815788873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407891936 + 407891937.

It is an arithmetic number, because the mean of its divisors is an integer number (407891937).

Almost surely, 2^815783873 is an apocalyptic number.

It is an amenable number.

815783873 is a deficient number, since it is larger than the sum of its proper divisors (1).

815783873 is an equidigital number, since it uses as much as digits as its factorization.

815783873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 50.

The square root of 815783873 is about 28561.9304844753. The cubic root of 815783873 is about 934.3832370470.

The spelling of 815783873 in words is "eight hundred fifteen million, seven hundred eighty-three thousand, eight hundred seventy-three".