99391634 has 4 divisors (see below), whose sum is σ = 149087454. Its totient is φ = 49695816.

The previous prime is 99391609. The next prime is 99391651. The reversal of 99391634 is 43619399.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43619399 = 17 ⋅2565847.

It can be written as a sum of positive squares in only one way, i.e., 60016009 + 39375625 = 7747^2 + 6275^2 .

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 24847907 + ... + 24847910.

Almost surely, 2^99391634 is an apocalyptic number.

99391634 is a deficient number, since it is larger than the sum of its proper divisors (49695820).

99391634 is a wasteful number, since it uses less digits than its factorization.

99391634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49695819.

The product of its digits is 157464, while the sum is 44.

The square root of 99391634 is about 9969.5352950877. The cubic root of 99391634 is about 463.2157065011.

The spelling of 99391634 in words is "ninety-nine million, three hundred ninety-one thousand, six hundred thirty-four".