321544642 has 4 divisors (see below), whose sum is σ = 482316966. Its totient is φ = 160772320.

The previous prime is 321544637. The next prime is 321544649. The reversal of 321544642 is 246445123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246445123 = 37 ⋅6660679.

It can be written as a sum of positive squares in only one way, i.e., 233203441 + 88341201 = 15271^2 + 9399^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (321544649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80386159 + ... + 80386162.

Almost surely, 2^321544642 is an apocalyptic number.

321544642 is a deficient number, since it is larger than the sum of its proper divisors (160772324).

321544642 is a wasteful number, since it uses less digits than its factorization.

321544642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160772323.

The product of its digits is 23040, while the sum is 31.

The square root of 321544642 is about 17931.6659014159. The cubic root of 321544642 is about 685.0891545741.

Adding to 321544642 its reverse (246445123), we get a palindrome (567989765).

The spelling of 321544642 in words is "three hundred twenty-one million, five hundred forty-four thousand, six hundred forty-two".