817842461 has 4 divisors (see below), whose sum is σ = 823812252. Its totient is φ = 811872672.

The previous prime is 817842451. The next prime is 817842469. The reversal of 817842461 is 164248718.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 164248718 = 2 ⋅82124359.

It can be written as a sum of positive squares in 2 ways, for example, as 466992100 + 350850361 = 21610^2 + 18731^2 .

It is a cyclic number.

It is not a de Polignac number, because 817842461 - 2²⁶ = 750733597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817842469) 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, 2984690 + ... + 2984963.

It is an arithmetic number, because the mean of its divisors is an integer number (205953063).

Almost surely, 2^817842461 is an apocalyptic number.

It is an amenable number.

817842461 is a deficient number, since it is larger than the sum of its proper divisors (5969791).

817842461 is a wasteful number, since it uses less digits than its factorization.

817842461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5969790.

The product of its digits is 86016, while the sum is 41.

The square root of 817842461 is about 28597.9450485520. The cubic root of 817842461 is about 935.1685326333.

The spelling of 817842461 in words is "eight hundred seventeen million, eight hundred forty-two thousand, four hundred sixty-one".