906815231 has 8 divisors (see below), whose sum is σ = 1041622560. Its totient is φ = 773323488.

The previous prime is 906815219. The next prime is 906815237. The reversal of 906815231 is 132518609.

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

It is a de Polignac number, because none of the positive numbers 2^k-906815231 is a prime.

It is a super-2 number, since 2×906815231² = 1644627726347166722, 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 = 906815191 and 906815200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (906815237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327416 + ... + 330173.

It is an arithmetic number, because the mean of its divisors is an integer number (130202820).

Almost surely, 2^906815231 is an apocalyptic number.

906815231 is a deficient number, since it is larger than the sum of its proper divisors (134807329).

906815231 is a wasteful number, since it uses less digits than its factorization.

906815231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657793.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 906815231 is about 30113.3729595341. The cubic root of 906815231 is about 967.9203081806.

The spelling of 906815231 in words is "nine hundred six million, eight hundred fifteen thousand, two hundred thirty-one".