86857774121 has 2 divisors, whose sum is σ = 86857774122. Its totient is φ = 86857774120.

The previous prime is 86857774063. The next prime is 86857774139. The reversal of 86857774121 is 12147775868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84994988521 + 1862785600 = 291539^2 + 43160^2 .

It is a cyclic number.

It is not a de Polignac number, because 86857774121 - 2²⁶ = 86790665257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (86857774141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43428887060 + 43428887061.

It is an arithmetic number, because the mean of its divisors is an integer number (43428887061).

Almost surely, 2^86857774121 is an apocalyptic number.

It is an amenable number.

86857774121 is a deficient number, since it is larger than the sum of its proper divisors (1).

86857774121 is an equidigital number, since it uses as much as digits as its factorization.

86857774121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5268480, while the sum is 56.

The spelling of 86857774121 in words is "eighty-six billion, eight hundred fifty-seven million, seven hundred seventy-four thousand, one hundred twenty-one".