81560341 has 2 divisors, whose sum is σ = 81560342. Its totient is φ = 81560340.

The previous prime is 81560309. The next prime is 81560351. The reversal of 81560341 is 14306518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72080100 + 9480241 = 8490^2 + 3079^2 .

It is a cyclic number.

It is not a de Polignac number, because 81560341 - 2⁵ = 81560309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81560351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40780170 + 40780171.

It is an arithmetic number, because the mean of its divisors is an integer number (40780171).

Almost surely, 2^81560341 is an apocalyptic number.

It is an amenable number.

81560341 is a deficient number, since it is larger than the sum of its proper divisors (1).

81560341 is an equidigital number, since it uses as much as digits as its factorization.

81560341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 81560341 is about 9031.0764031759. The cubic root of 81560341 is about 433.6702972090.

Adding to 81560341 its reverse (14306518), we get a palindrome (95866859).

The spelling of 81560341 in words is "eighty-one million, five hundred sixty thousand, three hundred forty-one".