86851993 has 2 divisors, whose sum is σ = 86851994. Its totient is φ = 86851992.

The previous prime is 86851991. The next prime is 86852009. The reversal of 86851993 is 39915868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78712384 + 8139609 = 8872^2 + 2853^2 .

It is a cyclic number.

It is not a de Polignac number, because 86851993 - 2¹ = 86851991 is a prime.

Together with 86851991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (86851991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43425996 + 43425997.

It is an arithmetic number, because the mean of its divisors is an integer number (43425997).

Almost surely, 2^86851993 is an apocalyptic number.

It is an amenable number.

86851993 is a deficient number, since it is larger than the sum of its proper divisors (1).

86851993 is an equidigital number, since it uses as much as digits as its factorization.

86851993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 49.

The square root of 86851993 is about 9319.4416678254. The cubic root of 86851993 is about 442.8533451882.

The spelling of 86851993 in words is "eighty-six million, eight hundred fifty-one thousand, nine hundred ninety-three".