99999550 has 48 divisors (see below), whose sum is σ = 217128960. Its totient is φ = 33550560.

The previous prime is 99999547. The next prime is 99999551. The reversal of 99999550 is 5599999.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99999491 and 99999500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13411 + ... + 19489.

It is an arithmetic number, because the mean of its divisors is an integer number (4523520).

Almost surely, 2^99999550 is an apocalyptic number.

99999550 is an abundant number, since it is smaller than the sum of its proper divisors (117129410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99999550 is a wasteful number, since it uses less digits than its factorization.

99999550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6145 (or 6140 counting only the distinct ones).

The product of its (nonzero) digits is 1476225, while the sum is 55.

The square root of 99999550 is about 9999.9774999747. The cubic root of 99999550 is about 464.1581871219.

The spelling of 99999550 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred fifty".