815228893 has 2 divisors, whose sum is σ = 815228894. Its totient is φ = 815228892.

The previous prime is 815228861. The next prime is 815228923. The reversal of 815228893 is 398822518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 592532964 + 222695929 = 24342^2 + 14923^2 .

It is a cyclic number.

It is not a de Polignac number, because 815228893 - 2⁵ = 815228861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815208893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407614446 + 407614447.

It is an arithmetic number, because the mean of its divisors is an integer number (407614447).

Almost surely, 2^815228893 is an apocalyptic number.

It is an amenable number.

815228893 is a deficient number, since it is larger than the sum of its proper divisors (1).

815228893 is an equidigital number, since it uses as much as digits as its factorization.

815228893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 46.

The square root of 815228893 is about 28552.2134518499. The cubic root of 815228893 is about 934.1713011557.

The spelling of 815228893 in words is "eight hundred fifteen million, two hundred twenty-eight thousand, eight hundred ninety-three".