43144690369 has 27 divisors (see below), whose sum is σ = 49635498787. Its totient is φ = 37471425200.

The previous prime is 43144690349. The next prime is 43144690373. The reversal of 43144690369 is 96309644134.

It is a happy number.

The square root of 43144690369 is 207713.

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., 11780280369 + 31364410000 = 108537^2 + 177100^2 .

It is not a de Polignac number, because 43144690369 - 2⁷ = 43144690241 is a prime.

It is a super-2 number, since 2×43144690369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43144690349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 52550979 + ... + 52551799.

Almost surely, 2^43144690369 is an apocalyptic number.

43144690369 is the 207713-rd square number.

43144690369 is the 103857-th centered octagonal number.

It is an amenable number.

43144690369 is a deficient number, since it is larger than the sum of its proper divisors (6490808418).

43144690369 is an frugal number, since it uses more digits than its factorization.

43144690369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 49.

Multiplying 43144690369 by its sum of digits (49), we get a square (2114089828081 = 1453991²).

The spelling of 43144690369 in words is "forty-three billion, one hundred forty-four million, six hundred ninety thousand, three hundred sixty-nine".