8121977 has 4 divisors (see below), whose sum is σ = 8320116. Its totient is φ = 7923840.

The previous prime is 8121973. The next prime is 8121983. The reversal of 8121977 is 7791218.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4393216 + 3728761 = 2096^2 + 1931^2 .

It is a cyclic number.

It is not a de Polignac number, because 8121977 - 2² = 8121973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8121973) by changing a digit.

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, 99008 + ... + 99089.

It is an arithmetic number, because the mean of its divisors is an integer number (2080029).

Almost surely, 2^8121977 is an apocalyptic number.

It is an amenable number.

8121977 is a deficient number, since it is larger than the sum of its proper divisors (198139).

8121977 is a wasteful number, since it uses less digits than its factorization.

8121977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198138.

The product of its digits is 7056, while the sum is 35.

The square root of 8121977 is about 2849.9082441370. The cubic root of 8121977 is about 201.0113522131.

The spelling of 8121977 in words is "eight million, one hundred twenty-one thousand, nine hundred seventy-seven".