80229781 has 2 divisors, whose sum is σ = 80229782. Its totient is φ = 80229780.

The previous prime is 80229763. The next prime is 80229859. The reversal of 80229781 is 18792208.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75099556 + 5130225 = 8666^2 + 2265^2 .

It is a cyclic number.

It is not a de Polignac number, because 80229781 - 2¹⁷ = 80098709 is a prime.

It is a super-2 number, since 2×80229781² = 12873635518615922, which contains 22 as substring.

It is equal to p_4681945 and since 80229781 and 4681945 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80229781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80229181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40114890 + 40114891.

It is an arithmetic number, because the mean of its divisors is an integer number (40114891).

Almost surely, 2^80229781 is an apocalyptic number.

It is an amenable number.

80229781 is a deficient number, since it is larger than the sum of its proper divisors (1).

80229781 is an equidigital number, since it uses as much as digits as its factorization.

80229781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 80229781 is about 8957.1078479607. The cubic root of 80229781 is about 431.2990837922.

The spelling of 80229781 in words is "eighty million, two hundred twenty-nine thousand, seven hundred eighty-one".