43528897981 has 4 divisors (see below), whose sum is σ = 43749857052. Its totient is φ = 43307938912.

The previous prime is 43528897967. The next prime is 43528898033. The reversal of 43528897981 is 18979882534.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20060189956 + 23468708025 = 141634^2 + 153195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43528897981 is a prime.

It is a super-2 number, since 2×43528897981² (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 (43528897931) 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, 110479240 + ... + 110479633.

It is an arithmetic number, because the mean of its divisors is an integer number (10937464263).

Almost surely, 2^43528897981 is an apocalyptic number.

It is an amenable number.

43528897981 is a deficient number, since it is larger than the sum of its proper divisors (220959071).

43528897981 is a wasteful number, since it uses less digits than its factorization.

43528897981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220959070.

The product of its digits is 34836480, while the sum is 64.

The spelling of 43528897981 in words is "forty-three billion, five hundred twenty-eight million, eight hundred ninety-seven thousand, nine hundred eighty-one".