858461221 has 4 divisors (see below), whose sum is σ = 859293292. Its totient is φ = 857629152.

The previous prime is 858461203. The next prime is 858461237. The reversal of 858461221 is 122164858.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 823058721 + 35402500 = 28689^2 + 5950^2 .

It is a cyclic number.

It is not a de Polignac number, because 858461221 - 2⁹ = 858460709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858261221) 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 in 3 ways as a sum of consecutive naturals, for example, 414486 + ... + 416551.

It is an arithmetic number, because the mean of its divisors is an integer number (214823323).

Almost surely, 2^858461221 is an apocalyptic number.

It is an amenable number.

858461221 is a deficient number, since it is larger than the sum of its proper divisors (832071).

858461221 is a wasteful number, since it uses less digits than its factorization.

858461221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832070.

The product of its digits is 30720, while the sum is 37.

The square root of 858461221 is about 29299.5088866691. The cubic root of 858461221 is about 950.4010203531.

The spelling of 858461221 in words is "eight hundred fifty-eight million, four hundred sixty-one thousand, two hundred twenty-one".