99421517 has 6 divisors (see below), whose sum is σ = 107657802. Its totient is φ = 91773552.

The previous prime is 99421493. The next prime is 99421523. The reversal of 99421517 is 71512499.

It can be written as a sum of positive squares in 3 ways, for example, as 14523721 + 84897796 = 3811^2 + 9214^2 .

It is not a de Polignac number, because 99421517 - 2⁸ = 99421261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99421717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293978 + ... + 294315.

It is an arithmetic number, because the mean of its divisors is an integer number (17942967).

Almost surely, 2^99421517 is an apocalyptic number.

It is an amenable number.

99421517 is a deficient number, since it is larger than the sum of its proper divisors (8236285).

99421517 is a wasteful number, since it uses less digits than its factorization.

99421517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588319 (or 588306 counting only the distinct ones).

The product of its digits is 22680, while the sum is 38.

The square root of 99421517 is about 9971.0338982475. The cubic root of 99421517 is about 463.2621251896.

The spelling of 99421517 in words is "ninety-nine million, four hundred twenty-one thousand, five hundred seventeen".