1321159969 has 2 divisors, whose sum is σ = 1321159970. Its totient is φ = 1321159968.

The previous prime is 1321159909. The next prime is 1321160017. The reversal of 1321159969 is 9699511231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 666414225 + 654745744 = 25815^2 + 25588^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321159969 - 2²¹ = 1319062817 is a prime.

It is a super-2 number, since 2×1321159969² = 3490927327376161922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1321159909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660579984 + 660579985.

It is an arithmetic number, because the mean of its divisors is an integer number (660579985).

Almost surely, 2^1321159969 is an apocalyptic number.

It is an amenable number.

1321159969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321159969 is an equidigital number, since it uses as much as digits as its factorization.

1321159969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131220, while the sum is 46.

The square root of 1321159969 is about 36347.7642916315. The cubic root of 1321159969 is about 1097.2825399236.

The spelling of 1321159969 in words is "one billion, three hundred twenty-one million, one hundred fifty-nine thousand, nine hundred sixty-nine".