1331021969 has 2 divisors, whose sum is σ = 1331021970. Its totient is φ = 1331021968.

The previous prime is 1331021959. The next prime is 1331022059. The reversal of 1331021969 is 9691201331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1018439569 + 312582400 = 31913^2 + 17680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331021969 - 2²⁴ = 1314244753 is a prime.

It is a super-2 number, since 2×1331021969² = 3543238963921273922, which contains 22 as substring.

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 (1331021959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665510984 + 665510985.

It is an arithmetic number, because the mean of its divisors is an integer number (665510985).

Almost surely, 2^1331021969 is an apocalyptic number.

It is an amenable number.

1331021969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331021969 is an equidigital number, since it uses as much as digits as its factorization.

1331021969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1331021969 is about 36483.1737791547. The cubic root of 1331021969 is about 1100.0060520328.

The spelling of 1331021969 in words is "one billion, three hundred thirty-one million, twenty-one thousand, nine hundred sixty-nine".