868906121 has 4 divisors (see below), whose sum is σ = 906684672. Its totient is φ = 831127572.

The previous prime is 868906067. The next prime is 868906123. The reversal of 868906121 is 121609868.

868906121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 868906121 - 2¹⁰ = 868905097 is a prime.

It is a super-2 number, since 2×868906121² = 1509995694222533282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (868906123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18889241 + ... + 18889286.

It is an arithmetic number, because the mean of its divisors is an integer number (226671168).

Almost surely, 2^868906121 is an apocalyptic number.

It is an amenable number.

868906121 is a deficient number, since it is larger than the sum of its proper divisors (37778551).

868906121 is a wasteful number, since it uses less digits than its factorization.

868906121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37778550.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 868906121 is about 29477.2135894830. The cubic root of 868906121 is about 954.2400031537.

The spelling of 868906121 in words is "eight hundred sixty-eight million, nine hundred six thousand, one hundred twenty-one".