80515261 has 2 divisors, whose sum is σ = 80515262. Its totient is φ = 80515260.

The previous prime is 80515241. The next prime is 80515271. The reversal of 80515261 is 16251508.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76230361 + 4284900 = 8731^2 + 2070^2 .

It is a cyclic number.

It is not a de Polignac number, because 80515261 - 2⁷ = 80515133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80515231) 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, 40257630 + 40257631.

It is an arithmetic number, because the mean of its divisors is an integer number (40257631).

Almost surely, 2^80515261 is an apocalyptic number.

It is an amenable number.

80515261 is a deficient number, since it is larger than the sum of its proper divisors (1).

80515261 is an equidigital number, since it uses as much as digits as its factorization.

80515261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 80515261 is about 8973.0296444401. The cubic root of 80515261 is about 431.8100391528.

Adding to 80515261 its reverse (16251508), we get a palindrome (96766769).

The spelling of 80515261 in words is "eighty million, five hundred fifteen thousand, two hundred sixty-one".