99999506 has 4 divisors (see below), whose sum is σ = 149999262. Its totient is φ = 49999752.

The previous prime is 99999481. The next prime is 99999509. The reversal of 99999506 is 60599999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60599999 = 439 ⋅138041.

It can be written as a sum of positive squares in only one way, i.e., 96216481 + 3783025 = 9809^2 + 1945^2 .

It is not an unprimeable number, because it can be changed into a prime (99999509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999875 + ... + 24999878.

Almost surely, 2^99999506 is an apocalyptic number.

99999506 is a deficient number, since it is larger than the sum of its proper divisors (49999756).

99999506 is a wasteful number, since it uses less digits than its factorization.

99999506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49999755.

The product of its (nonzero) digits is 1771470, while the sum is 56.

The square root of 99999506 is about 9999.9752999695. The cubic root of 99999506 is about 464.1581190451.

The spelling of 99999506 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred six".