43155820737481 has 9 divisors (see below), whose sum is σ = 43193883997173. Its totient is φ = 43117791007680.

The previous prime is 43155820737473. The next prime is 43155820737517. The reversal of 43155820737481 is 18473702855134.

The square root of 43155820737481 is 6569309.

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

It can be written as a sum of positive squares in 4 ways, for example, as 9841452877881 + 33314367859600 = 3137109^2 + 5771860^2 .

It is not a de Polignac number, because 43155820737481 - 2³ = 43155820737473 is a prime.

It is a super-2 number, since 2×43155820737481² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43155827737481) 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, 10175857521 + ... + 10175861761.

Almost surely, 2^{43155820737481} is an apocalyptic number.

43155820737481 is the 6569309-th square number.

43155820737481 is the 3284655-th centered octagonal number.

It is an amenable number.

43155820737481 is a deficient number, since it is larger than the sum of its proper divisors (38063259692).

43155820737481 is an frugal number, since it uses more digits than its factorization.

43155820737481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11580 (or 5790 counting only the distinct ones).

The product of its (nonzero) digits is 22579200, while the sum is 58.

The spelling of 43155820737481 in words is "forty-three trillion, one hundred fifty-five billion, eight hundred twenty million, seven hundred thirty-seven thousand, four hundred eighty-one".