6721155 has 48 divisors (see below), whose sum is σ = 14027520. Its totient is φ = 2908224.

The previous prime is 6721153. The next prime is 6721157. The reversal of 6721155 is 5511276.

It is an interprime number because it is at equal distance from previous prime (6721153) and next prime (6721157).

It is not a de Polignac number, because 6721155 - 2¹ = 6721153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6721153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5424 + ... + 6546.

It is an arithmetic number, because the mean of its divisors is an integer number (292240).

Almost surely, 2^6721155 is an apocalyptic number.

6721155 is an abundant number, since it is smaller than the sum of its proper divisors (7306365).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6721155 is a wasteful number, since it uses less digits than its factorization.

6721155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160 (or 1157 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 6721155 is about 2592.5190452531. The cubic root of 6721155 is about 188.7185699754.

The spelling of 6721155 in words is "six million, seven hundred twenty-one thousand, one hundred fifty-five".