815366417 has 4 divisors (see below), whose sum is σ = 815499300. Its totient is φ = 815233536.

The previous prime is 815366411. The next prime is 815366423. The reversal of 815366417 is 714663518.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (815366411) and next prime (815366423).

It can be written as a sum of positive squares in 2 ways, for example, as 746874241 + 68492176 = 27329^2 + 8276^2 .

It is a cyclic number.

It is not a de Polignac number, because 815366417 - 2²⁰ = 814317841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (815366411) 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, 56768 + ... + 69665.

It is an arithmetic number, because the mean of its divisors is an integer number (203874825).

Almost surely, 2^815366417 is an apocalyptic number.

It is an amenable number.

815366417 is a deficient number, since it is larger than the sum of its proper divisors (132883).

815366417 is a wasteful number, since it uses less digits than its factorization.

815366417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132882.

The product of its digits is 120960, while the sum is 41.

The square root of 815366417 is about 28554.6216399377. The cubic root of 815366417 is about 934.2238278148.

The spelling of 815366417 in words is "eight hundred fifteen million, three hundred sixty-six thousand, four hundred seventeen".