6635401 has 4 divisors (see below), whose sum is σ = 6640900. Its totient is φ = 6629904.

The previous prime is 6635359. The next prime is 6635407. The reversal of 6635401 is 1045366.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4309776 + 2325625 = 2076^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 6635401 - 2⁹ = 6634889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6635407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66 + ... + 3643.

It is an arithmetic number, because the mean of its divisors is an integer number (1660225).

Almost surely, 2^6635401 is an apocalyptic number.

It is an amenable number.

6635401 is a deficient number, since it is larger than the sum of its proper divisors (5499).

6635401 is a wasteful number, since it uses less digits than its factorization.

6635401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5498.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 6635401 is about 2575.9272117046. The cubic root of 6635401 is about 187.9125234350.

The spelling of 6635401 in words is "six million, six hundred thirty-five thousand, four hundred one".