99999549 has 16 divisors (see below), whose sum is σ = 159544000. Its totient is φ = 61537968.

The previous prime is 99999547. The next prime is 99999551. The reversal of 99999549 is 94599999.

It is an interprime number because it is at equal distance from previous prime (99999547) and next prime (99999551).

It is not a de Polignac number, because 99999549 - 2¹ = 99999547 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 (99999541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142099 + ... + 142800.

It is an arithmetic number, because the mean of its divisors is an integer number (9971500).

Almost surely, 2^99999549 is an apocalyptic number.

It is an amenable number.

99999549 is a deficient number, since it is larger than the sum of its proper divisors (59544451).

99999549 is a wasteful number, since it uses less digits than its factorization.

99999549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284921 (or 284915 counting only the distinct ones).

The product of its digits is 10628820, while the sum is 63.

The square root of 99999549 is about 9999.9774499746. The cubic root of 99999549 is about 464.1581855747.

The spelling of 99999549 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred forty-nine".