43787881613 has 6 divisors (see below), whose sum is σ = 50936923566. Its totient is φ = 37532469912.

The previous prime is 43787881589. The next prime is 43787881649. The reversal of 43787881613 is 31618878734.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 41567869924 + 2220011689 = 203882^2 + 47117^2 .

It is not a de Polignac number, because 43787881613 - 2⁶ = 43787881549 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 (43787881663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 446815070 + ... + 446815167.

It is an arithmetic number, because the mean of its divisors is an integer number (8489487261).

Almost surely, 2^43787881613 is an apocalyptic number.

It is an amenable number.

43787881613 is a deficient number, since it is larger than the sum of its proper divisors (7149041953).

43787881613 is an equidigital number, since it uses as much as digits as its factorization.

43787881613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893630251 (or 893630244 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 56.

The spelling of 43787881613 in words is "forty-three billion, seven hundred eighty-seven million, eight hundred eighty-one thousand, six hundred thirteen".