99138931 has 4 divisors (see below), whose sum is σ = 99365200. Its totient is φ = 98912664.

The previous prime is 99138929. The next prime is 99138953. The reversal of 99138931 is 13983199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13983199 = 1489 ⋅9391.

It is a cyclic number.

It is not a de Polignac number, because 99138931 - 2¹ = 99138929 is a prime.

It is a super-2 number, since 2×99138931² = 19657055279645522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99138911) 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 in 3 ways as a sum of consecutive naturals, for example, 112476 + ... + 113353.

It is an arithmetic number, because the mean of its divisors is an integer number (24841300).

Almost surely, 2^99138931 is an apocalyptic number.

99138931 is a deficient number, since it is larger than the sum of its proper divisors (226269).

99138931 is a wasteful number, since it uses less digits than its factorization.

99138931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226268.

The product of its digits is 52488, while the sum is 43.

The square root of 99138931 is about 9956.8534688425. The cubic root of 99138931 is about 462.8227983685.

The spelling of 99138931 in words is "ninety-nine million, one hundred thirty-eight thousand, nine hundred thirty-one".