321440051 has 2 divisors, whose sum is σ = 321440052. Its totient is φ = 321440050.

The previous prime is 321439999. The next prime is 321440057. The reversal of 321440051 is 150044123.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321440051 is a prime.

It is not a weakly prime, because it can be changed into another prime (321440057) 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 as a sum of consecutive naturals, namely, 160720025 + 160720026.

It is an arithmetic number, because the mean of its divisors is an integer number (160720026).

Almost surely, 2^321440051 is an apocalyptic number.

321440051 is a deficient number, since it is larger than the sum of its proper divisors (1).

321440051 is an equidigital number, since it uses as much as digits as its factorization.

321440051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 321440051 is about 17928.7492871087. The cubic root of 321440051 is about 685.0148653247.

Adding to 321440051 its reverse (150044123), we get a palindrome (471484174).

The spelling of 321440051 in words is "three hundred twenty-one million, four hundred forty thousand, fifty-one".