99981371 has 8 divisors (see below), whose sum is σ = 114926304. Its totient is φ = 85201920.

The previous prime is 99981347. The next prime is 99981377. The reversal of 99981371 is 17318999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99981371 - 2¹⁰ = 99980347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99981377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40070 + ... + 42491.

It is an arithmetic number, because the mean of its divisors is an integer number (14365788).

Almost surely, 2^99981371 is an apocalyptic number.

99981371 is a deficient number, since it is larger than the sum of its proper divisors (14944933).

99981371 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 13 representation: 99981371 = (17938199)₁₃.

99981371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82741.

The product of its digits is 122472, while the sum is 47.

The square root of 99981371 is about 9999.0685066160. The cubic root of 99981371 is about 464.1300588518.

The spelling of 99981371 in words is "ninety-nine million, nine hundred eighty-one thousand, three hundred seventy-one".