1020321689 has 2 divisors, whose sum is σ = 1020321690. Its totient is φ = 1020321688.

The previous prime is 1020321677. The next prime is 1020321697. The reversal of 1020321689 is 9861230201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1017099664 + 3222025 = 31892^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020321689 - 2⁸ = 1020321433 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1020321889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510160844 + 510160845.

It is an arithmetic number, because the mean of its divisors is an integer number (510160845).

Almost surely, 2^1020321689 is an apocalyptic number.

It is an amenable number.

1020321689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020321689 is an equidigital number, since it uses as much as digits as its factorization.

1020321689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1020321689 is about 31942.4746849708. The cubic root of 1020321689 is about 1006.7285217878.

The spelling of 1020321689 in words is "one billion, twenty million, three hundred twenty-one thousand, six hundred eighty-nine".