43571520091 has 16 divisors (see below), whose sum is σ = 50227061760. Its totient is φ = 37408662720.

The previous prime is 43571520079. The next prime is 43571520103. The reversal of 43571520091 is 19002517534.

It is an interprime number because it is at equal distance from previous prime (43571520079) and next prime (43571520103).

It is a de Polignac number, because none of the positive numbers 2^k-43571520091 is a prime.

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 43571520091.

It is not an unprimeable number, because it can be changed into a prime (43571560091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1070010 + ... + 1109983.

It is an arithmetic number, because the mean of its divisors is an integer number (3139191360).

Almost surely, 2^43571520091 is an apocalyptic number.

43571520091 is a deficient number, since it is larger than the sum of its proper divisors (6655541669).

43571520091 is a wasteful number, since it uses less digits than its factorization.

43571520091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180106.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 43571520091 in words is "forty-three billion, five hundred seventy-one million, five hundred twenty thousand, ninety-one".