43278318731 has 4 divisors (see below), whose sum is σ = 45556125000. Its totient is φ = 41000512464.

The previous prime is 43278318647. The next prime is 43278318737. The reversal of 43278318731 is 13781387234.

43278318731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 43278318731 - 2¹⁸ = 43278056587 is a prime.

It is a super-2 number, since 2×43278318731² (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 (43278318737) 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, 1138903106 + ... + 1138903143.

It is an arithmetic number, because the mean of its divisors is an integer number (11389031250).

Almost surely, 2^43278318731 is an apocalyptic number.

43278318731 is a deficient number, since it is larger than the sum of its proper divisors (2277806269).

43278318731 is a wasteful number, since it uses less digits than its factorization.

43278318731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277806268.

The product of its digits is 677376, while the sum is 47.

The spelling of 43278318731 in words is "forty-three billion, two hundred seventy-eight million, three hundred eighteen thousand, seven hundred thirty-one".