1026321661 has 2 divisors, whose sum is σ = 1026321662. Its totient is φ = 1026321660.

The previous prime is 1026321649. The next prime is 1026321677. The reversal of 1026321661 is 1661236201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 633528900 + 392792761 = 25170^2 + 19819^2 .

It is an emirp because it is prime and its reverse (1661236201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1026321661 - 2¹⁹ = 1025797373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1026321761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 513160830 + 513160831.

It is an arithmetic number, because the mean of its divisors is an integer number (513160831).

Almost surely, 2^1026321661 is an apocalyptic number.

It is an amenable number.

1026321661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1026321661 is an equidigital number, since it uses as much as digits as its factorization.

1026321661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1026321661 is about 32036.2554147641. The cubic root of 1026321661 is about 1008.6980122326.

Adding to 1026321661 its reverse (1661236201), we get a palindrome (2687557862).

The spelling of 1026321661 in words is "one billion, twenty-six million, three hundred twenty-one thousand, six hundred sixty-one".