321533031689 has 2 divisors, whose sum is σ = 321533031690. Its totient is φ = 321533031688.

The previous prime is 321533031683. The next prime is 321533031707. The reversal of 321533031689 is 986130335123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 297970781689 + 23562250000 = 545867^2 + 153500^2 .

It is a cyclic number.

It is not a de Polignac number, because 321533031689 - 2⁸ = 321533031433 is a prime.

It is not a weakly prime, because it can be changed into another prime (321533031683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160766515844 + 160766515845.

It is an arithmetic number, because the mean of its divisors is an integer number (160766515845).

Almost surely, 2^321533031689 is an apocalyptic number.

It is an amenable number.

321533031689 is a deficient number, since it is larger than the sum of its proper divisors (1).

321533031689 is an equidigital number, since it uses as much as digits as its factorization.

321533031689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 44.

The spelling of 321533031689 in words is "three hundred twenty-one billion, five hundred thirty-three million, thirty-one thousand, six hundred eighty-nine".