8121755 has 4 divisors (see below), whose sum is σ = 9746112. Its totient is φ = 6497400.

The previous prime is 8121749. The next prime is 8121793. The reversal of 8121755 is 5571218.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8121755 - 2⁴ = 8121739 is a prime.

It is a super-3 number, since 3×8121755³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812171 + ... + 812180.

It is an arithmetic number, because the mean of its divisors is an integer number (2436528).

Almost surely, 2^8121755 is an apocalyptic number.

8121755 is a deficient number, since it is larger than the sum of its proper divisors (1624357).

8121755 is a wasteful number, since it uses less digits than its factorization.

8121755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624356.

The product of its digits is 2800, while the sum is 29.

The square root of 8121755 is about 2849.8692952485. The cubic root of 8121755 is about 201.0095207655.

The spelling of 8121755 in words is "eight million, one hundred twenty-one thousand, seven hundred fifty-five".