8121450247 has 2 divisors, whose sum is σ = 8121450248. Its totient is φ = 8121450246.

The previous prime is 8121450217. The next prime is 8121450251. The reversal of 8121450247 is 7420541218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8121450247 - 2²³ = 8113061639 is a prime.

It is a super-2 number, since 2×8121450247² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8121450217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060725123 + 4060725124.

It is an arithmetic number, because the mean of its divisors is an integer number (4060725124).

Almost surely, 2^8121450247 is an apocalyptic number.

8121450247 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121450247 is an equidigital number, since it uses as much as digits as its factorization.

8121450247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 8121450247 is about 90119.0892486159. The cubic root of 8121450247 is about 2010.0700657077.

The spelling of 8121450247 in words is "eight billion, one hundred twenty-one million, four hundred fifty thousand, two hundred forty-seven".