815602441 has 2 divisors, whose sum is σ = 815602442. Its totient is φ = 815602440.

The previous prime is 815602439. The next prime is 815602451. The reversal of 815602441 is 144206518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 615238416 + 200364025 = 24804^2 + 14155^2 .

It is a cyclic number.

It is not a de Polignac number, because 815602441 - 2¹ = 815602439 is a prime.

Together with 815602439, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (815602451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407801220 + 407801221.

It is an arithmetic number, because the mean of its divisors is an integer number (407801221).

Almost surely, 2^815602441 is an apocalyptic number.

It is an amenable number.

815602441 is a deficient number, since it is larger than the sum of its proper divisors (1).

815602441 is an equidigital number, since it uses as much as digits as its factorization.

815602441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 815602441 is about 28558.7541920161. The cubic root of 815602441 is about 934.3139623309.

Adding to 815602441 its reverse (144206518), we get a palindrome (959808959).

The spelling of 815602441 in words is "eight hundred fifteen million, six hundred two thousand, four hundred forty-one".