908915879981 has 2 divisors, whose sum is σ = 908915879982. Its totient is φ = 908915879980.

The previous prime is 908915879869. The next prime is 908915879999. The reversal of 908915879981 is 189978519809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 768893981956 + 140021898025 = 876866^2 + 374195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-908915879981 is a prime.

It is a super-2 number, since 2×908915879981² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 908915879899 and 908915879908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (908915879281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454457939990 + 454457939991.

It is an arithmetic number, because the mean of its divisors is an integer number (454457939991).

Almost surely, 2^908915879981 is an apocalyptic number.

It is an amenable number.

908915879981 is a deficient number, since it is larger than the sum of its proper divisors (1).

908915879981 is an equidigital number, since it uses as much as digits as its factorization.

908915879981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117573120, while the sum is 74.

The spelling of 908915879981 in words is "nine hundred eight billion, nine hundred fifteen million, eight hundred seventy-nine thousand, nine hundred eighty-one".