80513749 has 2 divisors, whose sum is σ = 80513750. Its totient is φ = 80513748.

The previous prime is 80513747. The next prime is 80513753. The reversal of 80513749 is 94731508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74476900 + 6036849 = 8630^2 + 2457^2 .

It is a cyclic number.

It is not a de Polignac number, because 80513749 - 2¹ = 80513747 is a prime.

Together with 80513747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80513747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40256874 + 40256875.

It is an arithmetic number, because the mean of its divisors is an integer number (40256875).

Almost surely, 2^80513749 is an apocalyptic number.

It is an amenable number.

80513749 is a deficient number, since it is larger than the sum of its proper divisors (1).

80513749 is an equidigital number, since it uses as much as digits as its factorization.

80513749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 80513749 is about 8972.9453915646. The cubic root of 80513749 is about 431.8073361419.

The spelling of 80513749 in words is "eighty million, five hundred thirteen thousand, seven hundred forty-nine".