6400061 has 4 divisors (see below), whose sum is σ = 6411552. Its totient is φ = 6388572.

The previous prime is 6400033. The next prime is 6400091. The reversal of 6400061 is 1600046.

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 6400061 - 2¹⁸ = 6137917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400091) 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, 4865 + ... + 6038.

It is an arithmetic number, because the mean of its divisors is an integer number (1602888).

Almost surely, 2^6400061 is an apocalyptic number.

It is an amenable number.

6400061 is a deficient number, since it is larger than the sum of its proper divisors (11491).

6400061 is a wasteful number, since it uses less digits than its factorization.

6400061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11490.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 6400061 is about 2529.8341842896. The cubic root of 6400061 is about 185.6641432112.

The spelling of 6400061 in words is "six million, four hundred thousand, sixty-one".