84840131917 has 2 divisors, whose sum is σ = 84840131918. Its totient is φ = 84840131916.

The previous prime is 84840131911. The next prime is 84840131921. The reversal of 84840131917 is 71913104848.

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., 55720074601 + 29120057316 = 236051^2 + 170646^2 .

It is a cyclic number.

It is not a de Polignac number, because 84840131917 - 2³⁵ = 50480393549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84840131911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42420065958 + 42420065959.

It is an arithmetic number, because the mean of its divisors is an integer number (42420065959).

Almost surely, 2^84840131917 is an apocalyptic number.

It is an amenable number.

84840131917 is a deficient number, since it is larger than the sum of its proper divisors (1).

84840131917 is an equidigital number, since it uses as much as digits as its factorization.

84840131917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 84840131917 in words is "eighty-four billion, eight hundred forty million, one hundred thirty-one thousand, nine hundred seventeen".