43121345131 has 4 divisors (see below), whose sum is σ = 43126227000. Its totient is φ = 43116463264.

The previous prime is 43121345039. The next prime is 43121345147. The reversal of 43121345131 is 13154312134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13154312134 = 2 ⋅6577156067.

It is a cyclic number.

It is not a de Polignac number, because 43121345131 - 2⁹ = 43121344619 is a prime.

It is a super-2 number, since 2×43121345131² (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 43121345131.

It is not an unprimeable number, because it can be changed into a prime (43121345831) 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, 2427661 + ... + 2445358.

It is an arithmetic number, because the mean of its divisors is an integer number (10781556750).

Almost surely, 2^43121345131 is an apocalyptic number.

43121345131 is a deficient number, since it is larger than the sum of its proper divisors (4881869).

43121345131 is an equidigital number, since it uses as much as digits as its factorization.

43121345131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4881868.

The product of its digits is 4320, while the sum is 28.

Adding to 43121345131 its reverse (13154312134), we get a palindrome (56275657265).

The spelling of 43121345131 in words is "forty-three billion, one hundred twenty-one million, three hundred forty-five thousand, one hundred thirty-one".