6387121 has 8 divisors (see below), whose sum is σ = 7283304. Its totient is φ = 5548800.

The previous prime is 6387109. The next prime is 6387131. The reversal of 6387121 is 1217836.

It can be written as a sum of positive squares in 4 ways, for example, as 2852721 + 3534400 = 1689^2 + 1880^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6387121 - 2¹⁷ = 6256049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6387121.

It is not an unprimeable number, because it can be changed into a prime (6387131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14230 + ... + 14671.

It is an arithmetic number, because the mean of its divisors is an integer number (910413).

Almost surely, 2^6387121 is an apocalyptic number.

It is an amenable number.

6387121 is a deficient number, since it is larger than the sum of its proper divisors (896183).

6387121 is a wasteful number, since it uses less digits than its factorization.

6387121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28931.

The product of its digits is 2016, while the sum is 28.

The square root of 6387121 is about 2527.2754103975. The cubic root of 6387121 is about 185.5389300818.

The spelling of 6387121 in words is "six million, three hundred eighty-seven thousand, one hundred twenty-one".