815787853 has 2 divisors, whose sum is σ = 815787854. Its totient is φ = 815787852.

The previous prime is 815787839. The next prime is 815787899. The reversal of 815787853 is 358787518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 815787844 + 9 = 28562^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 815787853 - 2⁵ = 815787821 is a prime.

It is a super-2 number, since 2×815787853² = 1331019642204699218, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 815787853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815787053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407893926 + 407893927.

It is an arithmetic number, because the mean of its divisors is an integer number (407893927).

Almost surely, 2^815787853 is an apocalyptic number.

It is an amenable number.

815787853 is a deficient number, since it is larger than the sum of its proper divisors (1).

815787853 is an equidigital number, since it uses as much as digits as its factorization.

815787853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1881600, while the sum is 52.

The square root of 815787853 is about 28562.0001575520. Note that the first 3 decimals coincide. The cubic root of 815787853 is about 934.3847565832.

The spelling of 815787853 in words is "eight hundred fifteen million, seven hundred eighty-seven thousand, eight hundred fifty-three".