84573736939981 has 2 divisors, whose sum is σ = 84573736939982. Its totient is φ = 84573736939980.

The previous prime is 84573736939973. The next prime is 84573736940029. The reversal of 84573736939981 is 18993963737548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81032223204100 + 3541513735881 = 9001790^2 + 1881891^2 .

It is a cyclic number.

It is not a de Polignac number, because 84573736939981 - 2³ = 84573736939973 is a prime.

It is a super-2 number, since 2×84573736939981² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 84573736939895 and 84573736939904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84573731939981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42286868469990 + 42286868469991.

It is an arithmetic number, because the mean of its divisors is an integer number (42286868469991).

Almost surely, 2^{84573736939981} is an apocalyptic number.

It is an amenable number.

84573736939981 is a deficient number, since it is larger than the sum of its proper divisors (1).

84573736939981 is an equidigital number, since it uses as much as digits as its factorization.

84573736939981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7407106560, while the sum is 82.

The spelling of 84573736939981 in words is "eighty-four trillion, five hundred seventy-three billion, seven hundred thirty-six million, nine hundred thirty-nine thousand, nine hundred eighty-one".