1321121959 has 2 divisors, whose sum is σ = 1321121960. Its totient is φ = 1321121958.

The previous prime is 1321121951. The next prime is 1321121983. The reversal of 1321121959 is 9591211231.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321121959 - 2³ = 1321121951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321121951) 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, 660560979 + 660560980.

It is an arithmetic number, because the mean of its divisors is an integer number (660560980).

Almost surely, 2^1321121959 is an apocalyptic number.

1321121959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321121959 is an equidigital number, since it uses as much as digits as its factorization.

1321121959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 34.

The square root of 1321121959 is about 36347.2414221492. The cubic root of 1321121959 is about 1097.2720168201.

The spelling of 1321121959 in words is "one billion, three hundred twenty-one million, one hundred twenty-one thousand, nine hundred fifty-nine".