321381953 has 4 divisors (see below), whose sum is σ = 321705300. Its totient is φ = 321058608.

The previous prime is 321381947. The next prime is 321381959. The reversal of 321381953 is 359183123.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (321381947) and next prime (321381959).

It can be written as a sum of positive squares in 2 ways, for example, as 275792449 + 45589504 = 16607^2 + 6752^2 .

It is a cyclic number.

It is not a de Polignac number, because 321381953 - 2¹² = 321377857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (321381959) 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, 160178 + ... + 162171.

It is an arithmetic number, because the mean of its divisors is an integer number (80426325).

Almost surely, 2^321381953 is an apocalyptic number.

It is an amenable number.

321381953 is a deficient number, since it is larger than the sum of its proper divisors (323347).

321381953 is an equidigital number, since it uses as much as digits as its factorization.

321381953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323346.

The product of its digits is 19440, while the sum is 35.

The square root of 321381953 is about 17927.1289670153. The cubic root of 321381953 is about 684.9735923185.

The spelling of 321381953 in words is "three hundred twenty-one million, three hundred eighty-one thousand, nine hundred fifty-three".