80752561 has 2 divisors, whose sum is σ = 80752562. Its totient is φ = 80752560.

The previous prime is 80752543. The next prime is 80752577. The reversal of 80752561 is 16525708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67568400 + 13184161 = 8220^2 + 3631^2 .

It is a cyclic number.

It is not a de Polignac number, because 80752561 - 2⁷ = 80752433 is a prime.

It is a super-2 number, since 2×80752561² = 13041952216117442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80752531) 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, 40376280 + 40376281.

It is an arithmetic number, because the mean of its divisors is an integer number (40376281).

Almost surely, 2^80752561 is an apocalyptic number.

It is an amenable number.

80752561 is a deficient number, since it is larger than the sum of its proper divisors (1).

80752561 is an equidigital number, since it uses as much as digits as its factorization.

80752561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 80752561 is about 8986.2428745277. The cubic root of 80752561 is about 432.2338429474.

The spelling of 80752561 in words is "eighty million, seven hundred fifty-two thousand, five hundred sixty-one".