99603565 has 4 divisors (see below), whose sum is σ = 119524284. Its totient is φ = 79682848.

The previous prime is 99603551. The next prime is 99603571. The reversal of 99603565 is 56530699.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56530699 = 1669 ⋅33871.

It can be written as a sum of positive squares in 2 ways, for example, as 14115049 + 85488516 = 3757^2 + 9246^2 .

It is a cyclic number.

It is not a de Polignac number, because 99603565 - 2¹³ = 99595373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9960352 + ... + 9960361.

It is an arithmetic number, because the mean of its divisors is an integer number (29881071).

Almost surely, 2^99603565 is an apocalyptic number.

It is an amenable number.

99603565 is a deficient number, since it is larger than the sum of its proper divisors (19920719).

99603565 is a wasteful number, since it uses less digits than its factorization.

99603565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19920718.

The product of its (nonzero) digits is 218700, while the sum is 43.

The square root of 99603565 is about 9980.1585658746. The cubic root of 99603565 is about 463.5447082868.

The spelling of 99603565 in words is "ninety-nine million, six hundred three thousand, five hundred sixty-five".