43149412081 has 4 divisors (see below), whose sum is σ = 43169854464. Its totient is φ = 43128969700.

The previous prime is 43149412073. The next prime is 43149412109. The reversal of 43149412081 is 18021494134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43149412081 - 2³ = 43149412073 is a prime.

It is a super-2 number, since 2×43149412081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43149412081.

It is not an unprimeable number, because it can be changed into a prime (43149412381) 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, 10218025 + ... + 10222246.

It is an arithmetic number, because the mean of its divisors is an integer number (10792463616).

Almost surely, 2^43149412081 is an apocalyptic number.

It is an amenable number.

43149412081 is a deficient number, since it is larger than the sum of its proper divisors (20442383).

43149412081 is a wasteful number, since it uses less digits than its factorization.

43149412081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20442382.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 43149412081 in words is "forty-three billion, one hundred forty-nine million, four hundred twelve thousand, eighty-one".