80083781 has 4 divisors (see below), whose sum is σ = 80175564. Its totient is φ = 79992000.

The previous prime is 80083777. The next prime is 80083793. The reversal of 80083781 is 18738008.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12285025 + 67798756 = 3505^2 + 8234^2 .

It is a cyclic number.

It is not a de Polignac number, because 80083781 - 2² = 80083777 is a prime.

It is a super-2 number, since 2×80083781² = 12826823958511922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80083771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44570 + ... + 46331.

It is an arithmetic number, because the mean of its divisors is an integer number (20043891).

Almost surely, 2^80083781 is an apocalyptic number.

It is an amenable number.

80083781 is a deficient number, since it is larger than the sum of its proper divisors (91783).

80083781 is an equidigital number, since it uses as much as digits as its factorization.

80083781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91782.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 80083781 is about 8948.9541847078. The cubic root of 80083781 is about 431.0373027721.

The spelling of 80083781 in words is "eighty million, eighty-three thousand, seven hundred eighty-one".