99671379 has 4 divisors (see below), whose sum is σ = 132895176. Its totient is φ = 66447584.

The previous prime is 99671269. The next prime is 99671381. The reversal of 99671379 is 97317699.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99671379 - 2¹¹ = 99669331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99671179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16611894 + ... + 16611899.

It is an arithmetic number, because the mean of its divisors is an integer number (33223794).

Almost surely, 2^99671379 is an apocalyptic number.

99671379 is a deficient number, since it is larger than the sum of its proper divisors (33223797).

99671379 is a wasteful number, since it uses less digits than its factorization.

99671379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33223796.

The product of its digits is 642978, while the sum is 51.

The square root of 99671379 is about 9983.5554288039. Note that the first 3 decimals coincide. The cubic root of 99671379 is about 463.6498842060.

The spelling of 99671379 in words is "ninety-nine million, six hundred seventy-one thousand, three hundred seventy-nine".