321956945 has 8 divisors (see below), whose sum is σ = 386501544. Its totient is φ = 257463424.

The previous prime is 321956891. The next prime is 321956977. The reversal of 321956945 is 549659123.

It can be written as a sum of positive squares in 4 ways, for example, as 37258816 + 284698129 = 6104^2 + 16873^2 .

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

It is not a de Polignac number, because 321956945 - 2⁸ = 321956689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321956896 and 321956905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2837 + ... + 25533.

It is an arithmetic number, because the mean of its divisors is an integer number (48312693).

Almost surely, 2^321956945 is an apocalyptic number.

It is an amenable number.

321956945 is a deficient number, since it is larger than the sum of its proper divisors (64544599).

321956945 is a wasteful number, since it uses less digits than its factorization.

321956945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25539.

The product of its digits is 291600, while the sum is 44.

The square root of 321956945 is about 17943.1587241489. The cubic root of 321956945 is about 685.3818497213.

The spelling of 321956945 in words is "three hundred twenty-one million, nine hundred fifty-six thousand, nine hundred forty-five".