99369581 has 4 divisors (see below), whose sum is σ = 99389532. Its totient is φ = 99349632.

The previous prime is 99369547. The next prime is 99369587. The reversal of 99369581 is 18596399.

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 57002500 + 42367081 = 7550^2 + 6509^2 .

It is a cyclic number.

It is not a de Polignac number, because 99369581 - 2¹⁰ = 99368557 is a prime.

It is a super-2 number, since 2×99369581² = 19748627256231122, which 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 (99369587) 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, 4445 + ... + 14781.

It is an arithmetic number, because the mean of its divisors is an integer number (24847383).

Almost surely, 2^99369581 is an apocalyptic number.

It is an amenable number.

99369581 is a deficient number, since it is larger than the sum of its proper divisors (19951).

99369581 is a wasteful number, since it uses less digits than its factorization.

99369581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19950.

The product of its digits is 524880, while the sum is 50.

The square root of 99369581 is about 9968.4292142744. The cubic root of 99369581 is about 463.1814445577.

The spelling of 99369581 in words is "ninety-nine million, three hundred sixty-nine thousand, five hundred eighty-one".