99420161 has 4 divisors (see below), whose sum is σ = 100904112. Its totient is φ = 97936212.

The previous prime is 99420151. The next prime is 99420173. The reversal of 99420161 is 16102499.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16102499 = 7 ⋅2300357.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99420161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99420151) 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, 741875 + ... + 742008.

It is an arithmetic number, because the mean of its divisors is an integer number (25226028).

Almost surely, 2^99420161 is an apocalyptic number.

It is an amenable number.

99420161 is a deficient number, since it is larger than the sum of its proper divisors (1483951).

99420161 is a wasteful number, since it uses less digits than its factorization.

99420161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483950.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 99420161 is about 9970.9659010549. The cubic root of 99420161 is about 463.2600190517.

The spelling of 99420161 in words is "ninety-nine million, four hundred twenty thousand, one hundred sixty-one".