84672122981 has 2 divisors, whose sum is σ = 84672122982. Its totient is φ = 84672122980.

The previous prime is 84672122867. The next prime is 84672122987. The reversal of 84672122981 is 18922127648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75112172356 + 9559950625 = 274066^2 + 97775^2 .

It is a cyclic number.

It is not a de Polignac number, because 84672122981 - 2¹⁸ = 84671860837 is a prime.

It is a super-2 number, since 2×84672122981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84672122987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42336061490 + 42336061491.

It is an arithmetic number, because the mean of its divisors is an integer number (42336061491).

Almost surely, 2^84672122981 is an apocalyptic number.

It is an amenable number.

84672122981 is a deficient number, since it is larger than the sum of its proper divisors (1).

84672122981 is an equidigital number, since it uses as much as digits as its factorization.

84672122981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 50.

The spelling of 84672122981 in words is "eighty-four billion, six hundred seventy-two million, one hundred twenty-two thousand, nine hundred eighty-one".