867618221 has 2 divisors, whose sum is σ = 867618222. Its totient is φ = 867618220.

The previous prime is 867618133. The next prime is 867618229. The reversal of 867618221 is 122816768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855270025 + 12348196 = 29245^2 + 3514^2 .

It is a cyclic number.

It is not a de Polignac number, because 867618221 - 2²² = 863423917 is a prime.

It is a super-2 number, since 2×867618221² = 1505522754822409682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (867618229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433809110 + 433809111.

It is an arithmetic number, because the mean of its divisors is an integer number (433809111).

Almost surely, 2^867618221 is an apocalyptic number.

It is an amenable number.

867618221 is a deficient number, since it is larger than the sum of its proper divisors (1).

867618221 is an equidigital number, since it uses as much as digits as its factorization.

867618221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 867618221 is about 29455.3598008919. The cubic root of 867618221 is about 953.7683091600.

The spelling of 867618221 in words is "eight hundred sixty-seven million, six hundred eighteen thousand, two hundred twenty-one".