84415371881 has 2 divisors, whose sum is σ = 84415371882. Its totient is φ = 84415371880.

The previous prime is 84415371847. The next prime is 84415371883. The reversal of 84415371881 is 18817351448.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71484043225 + 12931328656 = 267365^2 + 113716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84415371881 is a prime.

It is a super-2 number, since 2×84415371881² (a number of 23 digits) contains 22 as substring.

Together with 84415371883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84415371883) 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, 42207685940 + 42207685941.

It is an arithmetic number, because the mean of its divisors is an integer number (42207685941).

Almost surely, 2^84415371881 is an apocalyptic number.

It is an amenable number.

84415371881 is a deficient number, since it is larger than the sum of its proper divisors (1).

84415371881 is an equidigital number, since it uses as much as digits as its factorization.

84415371881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 860160, while the sum is 50.

The spelling of 84415371881 in words is "eighty-four billion, four hundred fifteen million, three hundred seventy-one thousand, eight hundred eighty-one".