86826521 has 2 divisors, whose sum is σ = 86826522. Its totient is φ = 86826520.

The previous prime is 86826517. The next prime is 86826527. The reversal of 86826521 is 12562868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50694400 + 36132121 = 7120^2 + 6011^2 .

It is a cyclic number.

It is not a de Polignac number, because 86826521 - 2² = 86826517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (86826527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43413260 + 43413261.

It is an arithmetic number, because the mean of its divisors is an integer number (43413261).

Almost surely, 2^86826521 is an apocalyptic number.

It is an amenable number.

86826521 is a deficient number, since it is larger than the sum of its proper divisors (1).

86826521 is an equidigital number, since it uses as much as digits as its factorization.

86826521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 38.

The square root of 86826521 is about 9318.0749621368. The cubic root of 86826521 is about 442.8100475314.

The spelling of 86826521 in words is "eighty-six million, eight hundred twenty-six thousand, five hundred twenty-one".