81460817 has 2 divisors, whose sum is σ = 81460818. Its totient is φ = 81460816.

The previous prime is 81460801. The next prime is 81460829. The reversal of 81460817 is 71806418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62789776 + 18671041 = 7924^2 + 4321^2 .

It is a cyclic number.

It is not a de Polignac number, because 81460817 - 2⁴ = 81460801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81460837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40730408 + 40730409.

It is an arithmetic number, because the mean of its divisors is an integer number (40730409).

Almost surely, 2^81460817 is an apocalyptic number.

It is an amenable number.

81460817 is a deficient number, since it is larger than the sum of its proper divisors (1).

81460817 is an equidigital number, since it uses as much as digits as its factorization.

81460817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 81460817 is about 9025.5646360768. The cubic root of 81460817 is about 433.4938300290.

The spelling of 81460817 in words is "eighty-one million, four hundred sixty thousand, eight hundred seventeen".