43142994581 has 4 divisors (see below), whose sum is σ = 43750642464. Its totient is φ = 42535346700.

The previous prime is 43142994541. The next prime is 43142994607. The reversal of 43142994581 is 18549924134.

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 a de Polignac number, because none of the positive numbers 2^k-43142994581 is a prime.

It is a super-2 number, since 2×43142994581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43142994541) 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 3 ways as a sum of consecutive naturals, for example, 303823835 + ... + 303823976.

It is an arithmetic number, because the mean of its divisors is an integer number (10937660616).

Almost surely, 2^43142994581 is an apocalyptic number.

It is an amenable number.

43142994581 is a deficient number, since it is larger than the sum of its proper divisors (607647883).

43142994581 is an equidigital number, since it uses as much as digits as its factorization.

43142994581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607647882.

The product of its digits is 1244160, while the sum is 50.

The spelling of 43142994581 in words is "forty-three billion, one hundred forty-two million, nine hundred ninety-four thousand, five hundred eighty-one".