6401687 has 2 divisors, whose sum is σ = 6401688. Its totient is φ = 6401686.

The previous prime is 6401669. The next prime is 6401713. The reversal of 6401687 is 7861046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6401687 - 2¹² = 6397591 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6401387) 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 as a sum of consecutive naturals, namely, 3200843 + 3200844.

It is an arithmetic number, because the mean of its divisors is an integer number (3200844).

Almost surely, 2^6401687 is an apocalyptic number.

6401687 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401687 is an equidigital number, since it uses as much as digits as its factorization.

6401687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 6401687 is about 2530.1555288164. The cubic root of 6401687 is about 185.6798651621.

The spelling of 6401687 in words is "six million, four hundred one thousand, six hundred eighty-seven".