43138371561 has 8 divisors (see below), whose sum is σ = 57555900864. Its totient is φ = 28739878320.

The previous prime is 43138371553. The next prime is 43138371569. The reversal of 43138371561 is 16517383134.

It is an interprime number because it is at equal distance from previous prime (43138371553) and next prime (43138371569).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43138371561 - 2³ = 43138371553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43138371569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4753726 + ... + 4762791.

It is an arithmetic number, because the mean of its divisors is an integer number (7194487608).

Almost surely, 2^43138371561 is an apocalyptic number.

It is an amenable number.

43138371561 is a deficient number, since it is larger than the sum of its proper divisors (14417529303).

43138371561 is a wasteful number, since it uses less digits than its factorization.

43138371561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9518031.

The product of its digits is 181440, while the sum is 42.

The spelling of 43138371561 in words is "forty-three billion, one hundred thirty-eight million, three hundred seventy-one thousand, five hundred sixty-one".