6211855 has 16 divisors (see below), whose sum is σ = 8082144. Its totient is φ = 4556160.

The previous prime is 6211853. The next prime is 6211867. The reversal of 6211855 is 5581126.

6211855 = 1015² + 1016² + ... + 1020².

It is not a de Polignac number, because 6211855 - 2¹ = 6211853 is a prime.

It is a Duffinian number.

6211855 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6211853) 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 15 ways as a sum of consecutive naturals, for example, 14545 + ... + 14965.

It is an arithmetic number, because the mean of its divisors is an integer number (505134).

Almost surely, 2^6211855 is an apocalyptic number.

6211855 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6211855 is a deficient number, since it is larger than the sum of its proper divisors (1870289).

6211855 is a wasteful number, since it uses less digits than its factorization.

6211855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666.

The product of its digits is 2400, while the sum is 28.

The square root of 6211855 is about 2492.3593240141. The cubic root of 6211855 is about 183.8260702821.

The spelling of 6211855 in words is "six million, two hundred eleven thousand, eight hundred fifty-five".