868921349 has 2 divisors, whose sum is σ = 868921350. Its totient is φ = 868921348.

The previous prime is 868921309. The next prime is 868921381. The reversal of 868921349 is 943129868.

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., 863948449 + 4972900 = 29393^2 + 2230^2 .

It is a cyclic number.

It is not a de Polignac number, because 868921349 - 2²⁴ = 852144133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 868921297 and 868921306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868921309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434460674 + 434460675.

It is an arithmetic number, because the mean of its divisors is an integer number (434460675).

Almost surely, 2^868921349 is an apocalyptic number.

It is an amenable number.

868921349 is a deficient number, since it is larger than the sum of its proper divisors (1).

868921349 is an equidigital number, since it uses as much as digits as its factorization.

868921349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 50.

The square root of 868921349 is about 29477.4718895634. The cubic root of 868921349 is about 954.2455776270.

The spelling of 868921349 in words is "eight hundred sixty-eight million, nine hundred twenty-one thousand, three hundred forty-nine".