43865532481 has 3 divisors (see below), whose sum is σ = 43865741923. Its totient is φ = 43865323040.

The previous prime is 43865532479. The next prime is 43865532493. The reversal of 43865532481 is 18423556834.

The square root of 43865532481 is 209441.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 13686894081 + 30178638400 = 116991^2 + 173720^2 .

It is not a de Polignac number, because 43865532481 - 2¹ = 43865532479 is a prime.

It is a super-2 number, since 2×43865532481² (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 (43865532421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 104721 + ... + 314161.

Almost surely, 2^43865532481 is an apocalyptic number.

43865532481 is the 209441-st square number.

43865532481 is the 104721-st centered octagonal number.

It is an amenable number.

43865532481 is a deficient number, since it is larger than the sum of its proper divisors (209442).

43865532481 is an frugal number, since it uses more digits than its factorization.

43865532481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418882 (or 209441 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 49.

Multiplying 43865532481 by its sum of digits (49), we get a square (2149411091569 = 1466087²).

The spelling of 43865532481 in words is "forty-three billion, eight hundred sixty-five million, five hundred thirty-two thousand, four hundred eighty-one".