321681025 has 12 divisors (see below), whose sum is σ = 403692912. Its totient is φ = 254242640.

The previous prime is 321681023. The next prime is 321681029. The reversal of 321681025 is 520186123.

It is not a de Polignac number, because 321681025 - 2¹ = 321681023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321680984 and 321681002.

It is not an unprimeable number, because it can be changed into a prime (321681023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75439 + ... + 79588.

It is an arithmetic number, because the mean of its divisors is an integer number (33641076).

Almost surely, 2^321681025 is an apocalyptic number.

It is an amenable number.

321681025 is a deficient number, since it is larger than the sum of its proper divisors (82011887).

321681025 is a wasteful number, since it uses less digits than its factorization.

321681025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155120 (or 155115 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 321681025 is about 17935.4683518441. The cubic root of 321681025 is about 685.1860009576.

The spelling of 321681025 in words is "three hundred twenty-one million, six hundred eighty-one thousand, twenty-five".