80503781 has 2 divisors, whose sum is σ = 80503782. Its totient is φ = 80503780.

The previous prime is 80503777. The next prime is 80503811. The reversal of 80503781 is 18730508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80263681 + 240100 = 8959^2 + 490^2 .

It is a cyclic number.

It is not a de Polignac number, because 80503781 - 2² = 80503777 is a prime.

It is a super-2 number, since 2×80503781² = 12961717510591922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80503771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40251890 + 40251891.

It is an arithmetic number, because the mean of its divisors is an integer number (40251891).

Almost surely, 2^80503781 is an apocalyptic number.

It is an amenable number.

80503781 is a deficient number, since it is larger than the sum of its proper divisors (1).

80503781 is an equidigital number, since it uses as much as digits as its factorization.

80503781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 80503781 is about 8972.3899268812. The cubic root of 80503781 is about 431.7895154458.

The spelling of 80503781 in words is "eighty million, five hundred three thousand, seven hundred eighty-one".