6638161 has 4 divisors (see below), whose sum is σ = 6667632. Its totient is φ = 6608692.

The previous prime is 6638153. The next prime is 6638167. The reversal of 6638161 is 1618366.

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.

It is a cyclic number.

It is not a de Polignac number, because 6638161 - 2³ = 6638153 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6638167) 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, 14395 + ... + 14848.

It is an arithmetic number, because the mean of its divisors is an integer number (1666908).

Almost surely, 2^6638161 is an apocalyptic number.

It is an amenable number.

6638161 is a deficient number, since it is larger than the sum of its proper divisors (29471).

6638161 is a wasteful number, since it uses less digits than its factorization.

6638161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29470.

The product of its digits is 5184, while the sum is 31.

The square root of 6638161 is about 2576.4628854303. The cubic root of 6638161 is about 187.9385739415.

The spelling of 6638161 in words is "six million, six hundred thirty-eight thousand, one hundred sixty-one".