6440161 has 32 divisors (see below), whose sum is σ = 8805888. Its totient is φ = 4561920.

The previous prime is 6440149. The next prime is 6440171. The reversal of 6440161 is 1610446.

It is a cyclic number.

It is not a de Polignac number, because 6440161 - 2¹⁵ = 6407393 is a prime.

6440161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6440131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35491 + ... + 35671.

It is an arithmetic number, because the mean of its divisors is an integer number (275184).

Almost surely, 2^6440161 is an apocalyptic number.

It is an amenable number.

6440161 is a deficient number, since it is larger than the sum of its proper divisors (2365727).

6440161 is a wasteful number, since it uses less digits than its factorization.

6440161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 6440161 is about 2537.7472293355. The cubic root of 6440161 is about 186.0510997690.

The spelling of 6440161 in words is "six million, four hundred forty thousand, one hundred sixty-one".