99970217 has 4 divisors (see below), whose sum is σ = 105850836. Its totient is φ = 94089600.

The previous prime is 99970193. The next prime is 99970253. The reversal of 99970217 is 71207999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 81342361 + 18627856 = 9019^2 + 4316^2 .

It is a cyclic number.

It is not a de Polignac number, because 99970217 - 2¹² = 99966121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99970417) 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, 2940284 + ... + 2940317.

It is an arithmetic number, because the mean of its divisors is an integer number (26462709).

Almost surely, 2^99970217 is an apocalyptic number.

It is an amenable number.

99970217 is a deficient number, since it is larger than the sum of its proper divisors (5880619).

99970217 is a wasteful number, since it uses less digits than its factorization.

99970217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5880618.

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 99970217 is about 9998.5107391051. The cubic root of 99970217 is about 464.1127986391.

The spelling of 99970217 in words is "ninety-nine million, nine hundred seventy thousand, two hundred seventeen".