815421031 has 8 divisors (see below), whose sum is σ = 863855280. Its totient is φ = 767038848.

The previous prime is 815421017. The next prime is 815421049. The reversal of 815421031 is 130124518.

815421031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 815421031 - 2⁹ = 815420519 is a prime.

It is a super-2 number, since 2×815421031² = 1329822915594205922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 815420987 and 815421005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815421011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21940 + ... + 45958.

It is an arithmetic number, because the mean of its divisors is an integer number (107981910).

Almost surely, 2^815421031 is an apocalyptic number.

815421031 is a deficient number, since it is larger than the sum of its proper divisors (48434249).

815421031 is a wasteful number, since it uses less digits than its factorization.

815421031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26033.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 815421031 is about 28555.5779314655. The cubic root of 815421031 is about 934.2446857424.

Adding to 815421031 its reverse (130124518), we get a palindrome (945545549).

The spelling of 815421031 in words is "eight hundred fifteen million, four hundred twenty-one thousand, thirty-one".