99041520581 has 4 divisors (see below), whose sum is σ = 99058459500. Its totient is φ = 99024581664.

The previous prime is 99041520577. The next prime is 99041520629. The reversal of 99041520581 is 18502514099.

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 19625208100 + 79416312481 = 140090^2 + 281809^2 .

It is a cyclic number.

It is not a de Polignac number, because 99041520581 - 2² = 99041520577 is a prime.

It is a super-2 number, since 2×99041520581² (a number of 23 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 (99041520521) 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, 8460686 + ... + 8472383.

It is an arithmetic number, because the mean of its divisors is an integer number (24764614875).

Almost surely, 2^99041520581 is an apocalyptic number.

It is an amenable number.

99041520581 is a deficient number, since it is larger than the sum of its proper divisors (16938919).

99041520581 is a wasteful number, since it uses less digits than its factorization.

99041520581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16938918.

The product of its (nonzero) digits is 129600, while the sum is 44.

The spelling of 99041520581 in words is "ninety-nine billion, forty-one million, five hundred twenty thousand, five hundred eighty-one".