321989953 has 4 divisors (see below), whose sum is σ = 322088788. Its totient is φ = 321891120.

The previous prime is 321989881. The next prime is 321989971. The reversal of 321989953 is 359989123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 281132289 + 40857664 = 16767^2 + 6392^2 .

It is a cyclic number.

It is not a de Polignac number, because 321989953 - 2¹⁷ = 321858881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321989897 and 321989906.

It is not an unprimeable number, because it can be changed into a prime (321989153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44358 + ... + 51103.

It is an arithmetic number, because the mean of its divisors is an integer number (80522197).

Almost surely, 2^321989953 is an apocalyptic number.

It is an amenable number.

321989953 is a deficient number, since it is larger than the sum of its proper divisors (98835).

321989953 is an equidigital number, since it uses as much as digits as its factorization.

321989953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98834.

The product of its digits is 524880, while the sum is 49.

The square root of 321989953 is about 17944.0784940325. The cubic root of 321989953 is about 685.4052713944.

The spelling of 321989953 in words is "three hundred twenty-one million, nine hundred eighty-nine thousand, nine hundred fifty-three".