81283816932089 has 2 divisors, whose sum is σ = 81283816932090. Its totient is φ = 81283816932088.

The previous prime is 81283816932053. The next prime is 81283816932137. The reversal of 81283816932089 is 98023961838218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74301089956864 + 6982726975225 = 8619808^2 + 2642485^2 .

It is a cyclic number.

It is not a de Polignac number, because 81283816932089 - 2²⁰ = 81283815883513 is a prime.

It is a super-4 number, since 4×81283816932089⁴ (a number of 57 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (81283816932889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40641908466044 + 40641908466045.

It is an arithmetic number, because the mean of its divisors is an integer number (40641908466045).

Almost surely, 2^{81283816932089} is an apocalyptic number.

It is an amenable number.

81283816932089 is a deficient number, since it is larger than the sum of its proper divisors (1).

81283816932089 is an equidigital number, since it uses as much as digits as its factorization.

81283816932089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71663616, while the sum is 68.

The spelling of 81283816932089 in words is "eighty-one trillion, two hundred eighty-three billion, eight hundred sixteen million, nine hundred thirty-two thousand, eighty-nine".