7999902181 has 2 divisors, whose sum is σ = 7999902182. Its totient is φ = 7999902180.

The previous prime is 7999902151. The next prime is 7999902221. The reversal of 7999902181 is 1812099997.

7999902181 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7710596100 + 289306081 = 87810^2 + 17009^2 .

It is a cyclic number.

It is not a de Polignac number, because 7999902181 - 2¹³ = 7999893989 is a prime.

It is a super-2 number, since 2×7999902181² (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 (7999902151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3999951090 + 3999951091.

It is an arithmetic number, because the mean of its divisors is an integer number (3999951091).

Almost surely, 2^7999902181 is an apocalyptic number.

It is an amenable number.

7999902181 is a deficient number, since it is larger than the sum of its proper divisors (1).

7999902181 is an equidigital number, since it uses as much as digits as its factorization.

7999902181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 55.

The square root of 7999902181 is about 89442.1722734863. The cubic root of 7999902181 is about 1999.9918483834.

The spelling of 7999902181 in words is "seven billion, nine hundred ninety-nine million, nine hundred two thousand, one hundred eighty-one".