8121215983 has 2 divisors, whose sum is σ = 8121215984. Its totient is φ = 8121215982.

The previous prime is 8121215969. The next prime is 8121215989. The reversal of 8121215983 is 3895121218.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8121215983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8121215989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060607991 + 4060607992.

It is an arithmetic number, because the mean of its divisors is an integer number (4060607992).

Almost surely, 2^8121215983 is an apocalyptic number.

8121215983 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121215983 is an equidigital number, since it uses as much as digits as its factorization.

8121215983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 40.

The square root of 8121215983 is about 90117.7894924193. The cubic root of 8121215983 is about 2010.0507386349.

The spelling of 8121215983 in words is "eight billion, one hundred twenty-one million, two hundred fifteen thousand, nine hundred eighty-three".