7998161 has 4 divisors (see below), whose sum is σ = 8020800. Its totient is φ = 7975524.

The previous prime is 7998139. The next prime is 7998167. The reversal of 7998161 is 1618997.

It is a happy number.

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: 1618997 = 743 ⋅2179.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7998161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7998167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10781 + ... + 11498.

It is an arithmetic number, because the mean of its divisors is an integer number (2005200).

Almost surely, 2^7998161 is an apocalyptic number.

It is an amenable number.

7998161 is a deficient number, since it is larger than the sum of its proper divisors (22639).

7998161 is a wasteful number, since it uses less digits than its factorization.

7998161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22638.

The product of its digits is 27216, while the sum is 41.

The square root of 7998161 is about 2828.1020137187. The cubic root of 7998161 is about 199.9846738256.

The spelling of 7998161 in words is "seven million, nine hundred ninety-eight thousand, one hundred sixty-one".