815825441 has 4 divisors (see below), whose sum is σ = 816268992. Its totient is φ = 815381892.

The previous prime is 815825411. The next prime is 815825447. The reversal of 815825441 is 144528518.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 815825441 - 2⁶ = 815825377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 815825395 and 815825404.

It is not an unprimeable number, because it can be changed into a prime (815825447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219005 + ... + 222698.

It is an arithmetic number, because the mean of its divisors is an integer number (204067248).

Almost surely, 2^815825441 is an apocalyptic number.

It is an amenable number.

815825441 is a deficient number, since it is larger than the sum of its proper divisors (443551).

815825441 is a wasteful number, since it uses less digits than its factorization.

815825441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443550.

The product of its digits is 51200, while the sum is 38.

The square root of 815825441 is about 28562.6581571114. The cubic root of 815825441 is about 934.3991071747.

The spelling of 815825441 in words is "eight hundred fifteen million, eight hundred twenty-five thousand, four hundred forty-one".