6998161 has 2 divisors, whose sum is σ = 6998162. Its totient is φ = 6998160.

The previous prime is 6998153. The next prime is 6998171. The reversal of 6998161 is 1618996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6969600 + 28561 = 2640^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 6998161 - 2³ = 6998153 is a prime.

It is a super-4 number, since 4×6998161⁴ (a number of 28 digits) contains 4444 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6998111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3499080 + 3499081.

It is an arithmetic number, because the mean of its divisors is an integer number (3499081).

Almost surely, 2^6998161 is an apocalyptic number.

It is an amenable number.

6998161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6998161 is an equidigital number, since it uses as much as digits as its factorization.

6998161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 40.

The square root of 6998161 is about 2645.4037499028. The cubic root of 6998161 is about 191.2763649984.

The spelling of 6998161 in words is "six million, nine hundred ninety-eight thousand, one hundred sixty-one".