81702653 has 2 divisors, whose sum is σ = 81702654. Its totient is φ = 81702652.

The previous prime is 81702631. The next prime is 81702683. The reversal of 81702653 is 35620718.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72624484 + 9078169 = 8522^2 + 3013^2 .

It is a cyclic number.

It is not a de Polignac number, because 81702653 - 2⁶ = 81702589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81702683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40851326 + 40851327.

It is an arithmetic number, because the mean of its divisors is an integer number (40851327).

Almost surely, 2^81702653 is an apocalyptic number.

It is an amenable number.

81702653 is a deficient number, since it is larger than the sum of its proper divisors (1).

81702653 is an equidigital number, since it uses as much as digits as its factorization.

81702653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 81702653 is about 9038.9519857116. The cubic root of 81702653 is about 433.9223830702.

The spelling of 81702653 in words is "eighty-one million, seven hundred two thousand, six hundred fifty-three".