99812549 has 4 divisors (see below), whose sum is σ = 100064364. Its totient is φ = 99560736.

The previous prime is 99812539. The next prime is 99812551. The reversal of 99812549 is 94521899.

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 70728100 + 29084449 = 8410^2 + 5393^2 .

It is a cyclic number.

It is not a de Polignac number, because 99812549 - 2⁴ = 99812533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99812539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125312 + ... + 126105.

It is an arithmetic number, because the mean of its divisors is an integer number (25016091).

Almost surely, 2^99812549 is an apocalyptic number.

It is an amenable number.

99812549 is a deficient number, since it is larger than the sum of its proper divisors (251815).

99812549 is a wasteful number, since it uses less digits than its factorization.

99812549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251814.

The product of its digits is 233280, while the sum is 47.

The square root of 99812549 is about 9990.6230536439. The cubic root of 99812549 is about 463.8686784655.

The spelling of 99812549 in words is "ninety-nine million, eight hundred twelve thousand, five hundred forty-nine".