810725813 has 2 divisors, whose sum is σ = 810725814. Its totient is φ = 810725812.

The previous prime is 810725771. The next prime is 810725849. The reversal of 810725813 is 318527018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 805310884 + 5414929 = 28378^2 + 2327^2 .

It is a cyclic number.

It is not a de Polignac number, because 810725813 - 2⁶ = 810725749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (810775813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405362906 + 405362907.

It is an arithmetic number, because the mean of its divisors is an integer number (405362907).

Almost surely, 2^810725813 is an apocalyptic number.

It is an amenable number.

810725813 is a deficient number, since it is larger than the sum of its proper divisors (1).

810725813 is an equidigital number, since it uses as much as digits as its factorization.

810725813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 810725813 is about 28473.2473209502. The cubic root of 810725813 is about 932.4480970280.

The spelling of 810725813 in words is "eight hundred ten million, seven hundred twenty-five thousand, eight hundred thirteen".