80119981 has 2 divisors, whose sum is σ = 80119982. Its totient is φ = 80119980.

The previous prime is 80119973. The next prime is 80119999. The reversal of 80119981 is 18991108.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65755881 + 14364100 = 8109^2 + 3790^2 .

It is a cyclic number.

It is not a de Polignac number, because 80119981 - 2³ = 80119973 is a prime.

It is a super-2 number, since 2×80119981² = 12838422710880722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 80119981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80119931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40059990 + 40059991.

It is an arithmetic number, because the mean of its divisors is an integer number (40059991).

Almost surely, 2^80119981 is an apocalyptic number.

It is an amenable number.

80119981 is a deficient number, since it is larger than the sum of its proper divisors (1).

80119981 is an equidigital number, since it uses as much as digits as its factorization.

80119981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 80119981 is about 8950.9765389035. The cubic root of 80119981 is about 431.1022397655.

The spelling of 80119981 in words is "eighty million, one hundred nineteen thousand, nine hundred eighty-one".