867936521 has 2 divisors, whose sum is σ = 867936522. Its totient is φ = 867936520.

The previous prime is 867936497. The next prime is 867936523. The reversal of 867936521 is 125639768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 720654025 + 147282496 = 26845^2 + 12136^2 .

It is a cyclic number.

It is not a de Polignac number, because 867936521 - 2⁶ = 867936457 is a prime.

Together with 867936523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (867936523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433968260 + 433968261.

It is an arithmetic number, because the mean of its divisors is an integer number (433968261).

Almost surely, 2^867936521 is an apocalyptic number.

It is an amenable number.

867936521 is a deficient number, since it is larger than the sum of its proper divisors (1).

867936521 is an equidigital number, since it uses as much as digits as its factorization.

867936521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 867936521 is about 29460.7623967880. The cubic root of 867936521 is about 953.8849300915.

The spelling of 867936521 in words is "eight hundred sixty-seven million, nine hundred thirty-six thousand, five hundred twenty-one".