86921369 has 2 divisors, whose sum is σ = 86921370. Its totient is φ = 86921368.

The previous prime is 86921327. The next prime is 86921389. The reversal of 86921369 is 96312968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83265625 + 3655744 = 9125^2 + 1912^2 .

It is a cyclic number.

It is not a de Polignac number, because 86921369 - 2¹⁶ = 86855833 is a prime.

It is a super-2 number, since 2×86921369² = 15110648777668322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86921389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43460684 + 43460685.

It is an arithmetic number, because the mean of its divisors is an integer number (43460685).

Almost surely, 2^86921369 is an apocalyptic number.

It is an amenable number.

86921369 is a deficient number, since it is larger than the sum of its proper divisors (1).

86921369 is an equidigital number, since it uses as much as digits as its factorization.

86921369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 86921369 is about 9323.1630362233. The cubic root of 86921369 is about 442.9712285581.

The spelling of 86921369 in words is "eighty-six million, nine hundred twenty-one thousand, three hundred sixty-nine".