1329550369 has 9 divisors (see below), whose sum is σ = 1546916787. Its totient is φ = 1139395824.

The previous prime is 1329550367. The next prime is 1329550373. The reversal of 1329550369 is 9630559231.

The square root of 1329550369 is 36463.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1304148769 + 25401600 = 36113^2 + 5040^2 .

It is not a de Polignac number, because 1329550369 - 2¹ = 1329550367 is a prime.

It is a super-2 number, since 2×1329550369² = 3535408367416072322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1329550363) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 252637 + ... + 257845.

It is an arithmetic number, because the mean of its divisors is an integer number (171879643).

Almost surely, 2^1329550369 is an apocalyptic number.

1329550369 is the 36463-rd square number.

1329550369 is the 18232-nd centered octagonal number.

It is an amenable number.

1329550369 is a deficient number, since it is larger than the sum of its proper divisors (217366418).

1329550369 is an frugal number, since it uses more digits than its factorization.

1329550369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10432 (or 5216 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 43.

The cubic root of 1329550369 is about 1099.6005075490.

The spelling of 1329550369 in words is "one billion, three hundred twenty-nine million, five hundred fifty thousand, three hundred sixty-nine".