99917145 has 20 divisors (see below), whose sum is σ = 179111460. Its totient is φ = 53288928.

The previous prime is 99917101. The next prime is 99917189. The reversal of 99917145 is 54171999.

It is an interprime number because it is at equal distance from previous prime (99917101) and next prime (99917189).

It can be written as a sum of positive squares in 2 ways, for example, as 54597321 + 45319824 = 7389^2 + 6732^2 .

It is not a de Polignac number, because 99917145 - 2⁸ = 99916889 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 99917145.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 122950 + ... + 123759.

It is an arithmetic number, because the mean of its divisors is an integer number (8955573).

Almost surely, 2^99917145 is an apocalyptic number.

It is an amenable number.

99917145 is a deficient number, since it is larger than the sum of its proper divisors (79194315).

99917145 is a wasteful number, since it uses less digits than its factorization.

99917145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246726 (or 246717 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 99917145 is about 9995.8563915254. The cubic root of 99917145 is about 464.0306549926.

The spelling of 99917145 in words is "ninety-nine million, nine hundred seventeen thousand, one hundred forty-five".