1388531169 has 9 divisors (see below), whose sum is σ = 2005817619. Its totient is φ = 925612920.

The previous prime is 1388531161. The next prime is 1388531171. The reversal of 1388531169 is 9611358831.

It is a happy number.

The square root of 1388531169 is 37263.

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., 1344175569 + 44355600 = 36663^2 + 6660^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1388531169 - 2³ = 1388531161 is a prime.

It is a super-2 number, since 2×1388531169² = 3856037614569013122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1388531161) 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, 105579 + ... + 117999.

Almost surely, 2^1388531169 is an apocalyptic number.

1388531169 is the 37263-rd square number.

1388531169 is the 18632-nd centered octagonal number.

It is an amenable number.

1388531169 is a deficient number, since it is larger than the sum of its proper divisors (617286450).

1388531169 is an frugal number, since it uses more digits than its factorization.

1388531169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24848 (or 12424 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The cubic root of 1388531169 is about 1115.6257874532.

It can be divided in two parts, 13885 and 31169, that added together give a palindrome (45054).

The spelling of 1388531169 in words is "one billion, three hundred eighty-eight million, five hundred thirty-one thousand, one hundred sixty-nine".