86845921 has 2 divisors, whose sum is σ = 86845922. Its totient is φ = 86845920.

The previous prime is 86845909. The next prime is 86845931. The reversal of 86845921 is 12954868.

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., 78499600 + 8346321 = 8860^2 + 2889^2 .

It is a cyclic number.

It is not a de Polignac number, because 86845921 - 2¹¹ = 86843873 is a prime.

It is not a weakly prime, because it can be changed into another prime (86845931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43422960 + 43422961.

It is an arithmetic number, because the mean of its divisors is an integer number (43422961).

Almost surely, 2^86845921 is an apocalyptic number.

It is an amenable number.

86845921 is a deficient number, since it is larger than the sum of its proper divisors (1).

86845921 is an equidigital number, since it uses as much as digits as its factorization.

86845921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 43.

The square root of 86845921 is about 9319.1158915425. The cubic root of 86845921 is about 442.8430246874.

The spelling of 86845921 in words is "eighty-six million, eight hundred forty-five thousand, nine hundred twenty-one".