1331229569 has 2 divisors, whose sum is σ = 1331229570. Its totient is φ = 1331229568.

The previous prime is 1331229563. The next prime is 1331229583. The reversal of 1331229569 is 9659221331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1189905025 + 141324544 = 34495^2 + 11888^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331229569 - 2²⁰ = 1330180993 is a prime.

It is a super-2 number, since 2×1331229569² = 3544344330759851522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1331229563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665614784 + 665614785.

It is an arithmetic number, because the mean of its divisors is an integer number (665614785).

Almost surely, 2^1331229569 is an apocalyptic number.

It is an amenable number.

1331229569 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331229569 is an equidigital number, since it uses as much as digits as its factorization.

1331229569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 41.

The square root of 1331229569 is about 36486.0188154312. The cubic root of 1331229569 is about 1100.0632385131.

The spelling of 1331229569 in words is "one billion, three hundred thirty-one million, two hundred twenty-nine thousand, five hundred sixty-nine".