99641138 has 4 divisors (see below), whose sum is σ = 149461710. Its totient is φ = 49820568.

The previous prime is 99641137. The next prime is 99641153. The reversal of 99641138 is 83114699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83114699 = 349 ⋅238151.

It can be written as a sum of positive squares in only one way, i.e., 97278769 + 2362369 = 9863^2 + 1537^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 99641095 and 99641104.

It is not an unprimeable number, because it can be changed into a prime (99641137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24910283 + ... + 24910286.

Almost surely, 2^99641138 is an apocalyptic number.

99641138 is a deficient number, since it is larger than the sum of its proper divisors (49820572).

99641138 is a wasteful number, since it uses less digits than its factorization.

99641138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49820571.

The product of its digits is 46656, while the sum is 41.

The square root of 99641138 is about 9982.0407733088. The cubic root of 99641138 is about 463.6029879135.

The spelling of 99641138 in words is "ninety-nine million, six hundred forty-one thousand, one hundred thirty-eight".