86964821 has 2 divisors, whose sum is σ = 86964822. Its totient is φ = 86964820.

The previous prime is 86964751. The next prime is 86964853. The reversal of 86964821 is 12846968.

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., 77880625 + 9084196 = 8825^2 + 3014^2 .

It is a cyclic number.

It is not a de Polignac number, because 86964821 - 2¹⁴ = 86948437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86964721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43482410 + 43482411.

It is an arithmetic number, because the mean of its divisors is an integer number (43482411).

Almost surely, 2^86964821 is an apocalyptic number.

It is an amenable number.

86964821 is a deficient number, since it is larger than the sum of its proper divisors (1).

86964821 is an equidigital number, since it uses as much as digits as its factorization.

86964821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 44.

The square root of 86964821 is about 9325.4930700741. The cubic root of 86964821 is about 443.0450300470.

The spelling of 86964821 in words is "eighty-six million, nine hundred sixty-four thousand, eight hundred twenty-one".