99691045 has 4 divisors (see below), whose sum is σ = 119629260. Its totient is φ = 79752832.

The previous prime is 99691037. The next prime is 99691087. The reversal of 99691045 is 54019699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54019699 = 107 ⋅504857.

It can be written as a sum of positive squares in 2 ways, for example, as 18852964 + 80838081 = 4342^2 + 8991^2 .

It is a cyclic number.

It is not a de Polignac number, because 99691045 - 2³ = 99691037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99690992 and 99691010.

It is a congruent 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 in 3 ways as a sum of consecutive naturals, for example, 9969100 + ... + 9969109.

It is an arithmetic number, because the mean of its divisors is an integer number (29907315).

Almost surely, 2^99691045 is an apocalyptic number.

It is an amenable number.

99691045 is a deficient number, since it is larger than the sum of its proper divisors (19938215).

99691045 is a wasteful number, since it uses less digits than its factorization.

99691045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19938214.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 99691045 is about 9984.5402998836. The cubic root of 99691045 is about 463.6803762058.

The spelling of 99691045 in words is "ninety-nine million, six hundred ninety-one thousand, forty-five".