43071621749 has 4 divisors (see below), whose sum is σ = 46384823436. Its totient is φ = 39758420064.

The previous prime is 43071621713. The next prime is 43071621781. The reversal of 43071621749 is 94712617034.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14984208100 + 28087413649 = 122410^2 + 167593^2 .

It is a cyclic number.

It is not a de Polignac number, because 43071621749 - 2²⁰ = 43070573173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43071621149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1656600824 + ... + 1656600849.

It is an arithmetic number, because the mean of its divisors is an integer number (11596205859).

Almost surely, 2^43071621749 is an apocalyptic number.

It is an amenable number.

43071621749 is a deficient number, since it is larger than the sum of its proper divisors (3313201687).

43071621749 is a wasteful number, since it uses less digits than its factorization.

43071621749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3313201686.

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 43071621749 in words is "forty-three billion, seventy-one million, six hundred twenty-one thousand, seven hundred forty-nine".