86171239381 has 2 divisors, whose sum is σ = 86171239382. Its totient is φ = 86171239380.

The previous prime is 86171239339. The next prime is 86171239403. The reversal of 86171239381 is 18393217168.

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., 78386000625 + 7785238756 = 279975^2 + 88234^2 .

It is a cyclic number.

It is not a de Polignac number, because 86171239381 - 2²⁵ = 86137684949 is a prime.

It is a super-2 number, since 2×86171239381² (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 (86171234381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43085619690 + 43085619691.

It is an arithmetic number, because the mean of its divisors is an integer number (43085619691).

Almost surely, 2^86171239381 is an apocalyptic number.

It is an amenable number.

86171239381 is a deficient number, since it is larger than the sum of its proper divisors (1).

86171239381 is an equidigital number, since it uses as much as digits as its factorization.

86171239381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The spelling of 86171239381 in words is "eighty-six billion, one hundred seventy-one million, two hundred thirty-nine thousand, three hundred eighty-one".