99971005 has 4 divisors (see below), whose sum is σ = 119965212. Its totient is φ = 79976800.

The previous prime is 99970993. The next prime is 99971017. The reversal of 99971005 is 50017999.

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

It is an interprime number because it is at equal distance from previous prime (99970993) and next prime (99971017).

It can be written as a sum of positive squares in 2 ways, for example, as 26594649 + 73376356 = 5157^2 + 8566^2 .

It is a de Polignac number, because none of the positive numbers 2^k-99971005 is a prime.

It is a super-3 number, since 3×99971005³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9997096 + ... + 9997105.

It is an arithmetic number, because the mean of its divisors is an integer number (29991303).

Almost surely, 2^99971005 is an apocalyptic number.

It is an amenable number.

99971005 is a deficient number, since it is larger than the sum of its proper divisors (19994207).

99971005 is a wasteful number, since it uses less digits than its factorization.

99971005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19994206.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 99971005 is about 9998.5501448960. The cubic root of 99971005 is about 464.1140180687.

The spelling of 99971005 in words is "ninety-nine million, nine hundred seventy-one thousand, five".