815494421 has 16 divisors (see below), whose sum is σ = 997138560. Its totient is φ = 651343680.

The previous prime is 815494399. The next prime is 815494457. The reversal of 815494421 is 124494518.

815494421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 815494421 - 2¹⁸ = 815232277 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815494481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42146 + ... + 58371.

It is an arithmetic number, because the mean of its divisors is an integer number (62321160).

Almost surely, 2^815494421 is an apocalyptic number.

It is an amenable number.

815494421 is a deficient number, since it is larger than the sum of its proper divisors (181644139).

815494421 is a wasteful number, since it uses less digits than its factorization.

815494421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100604.

The product of its digits is 46080, while the sum is 38.

The square root of 815494421 is about 28556.8629404562. The cubic root of 815494421 is about 934.2727130469.

The spelling of 815494421 in words is "eight hundred fifteen million, four hundred ninety-four thousand, four hundred twenty-one".