6218155 has 4 divisors (see below), whose sum is σ = 7461792. Its totient is φ = 4974520.

The previous prime is 6218143. The next prime is 6218159. The reversal of 6218155 is 5518126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5518126 = 2 ⋅2759063.

It is not a de Polignac number, because 6218155 - 2⁹ = 6217643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6218159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621811 + ... + 621820.

It is an arithmetic number, because the mean of its divisors is an integer number (1865448).

Almost surely, 2^6218155 is an apocalyptic number.

6218155 is a deficient number, since it is larger than the sum of its proper divisors (1243637).

6218155 is a wasteful number, since it uses less digits than its factorization.

6218155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243636.

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

The square root of 6218155 is about 2493.6228664335. The cubic root of 6218155 is about 183.8881941270. Note that the first 3 decimals are identical.

The spelling of 6218155 in words is "six million, two hundred eighteen thousand, one hundred fifty-five".