6387561 has 6 divisors (see below), whose sum is σ = 9226490. Its totient is φ = 4258368.

The previous prime is 6387559. The next prime is 6387611. The reversal of 6387561 is 1657836.

It can be written as a sum of positive squares in only one way, i.e., 6095961 + 291600 = 2469^2 + 540^2 .

It is not a de Polignac number, because 6387561 - 2¹ = 6387559 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6387541) 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 5 ways as a sum of consecutive naturals, for example, 354856 + ... + 354873.

Almost surely, 2^6387561 is an apocalyptic number.

It is an amenable number.

6387561 is a deficient number, since it is larger than the sum of its proper divisors (2838929).

6387561 is a wasteful number, since it uses less digits than its factorization.

6387561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709735 (or 709732 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 6387561 is about 2527.3624591657. The cubic root of 6387561 is about 185.5431904913.

It can be divided in two parts, 63875 and 61, that added together give a palindrome (63936).

The spelling of 6387561 in words is "six million, three hundred eighty-seven thousand, five hundred sixty-one".