831621225 has 48 divisors (see below), whose sum is σ = 1418480640. Its totient is φ = 429710400.

The previous prime is 831621191. The next prime is 831621233. The reversal of 831621225 is 522126138.

It is not a de Polignac number, because 831621225 - 2⁸ = 831620969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 831621192 and 831621201.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 312852 + ... + 315498.

It is an arithmetic number, because the mean of its divisors is an integer number (29551680).

Almost surely, 2^831621225 is an apocalyptic number.

It is an amenable number.

831621225 is a deficient number, since it is larger than the sum of its proper divisors (586859415).

831621225 is a wasteful number, since it uses less digits than its factorization.

831621225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790 (or 2785 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 831621225 is about 28837.8436260411. The cubic root of 831621225 is about 940.3911247701.

The spelling of 831621225 in words is "eight hundred thirty-one million, six hundred twenty-one thousand, two hundred twenty-five".