856471949 has 4 divisors (see below), whose sum is σ = 901549440. Its totient is φ = 811394460.

The previous prime is 856471939. The next prime is 856471961. The reversal of 856471949 is 949174658.

856471949 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 856471949 - 2¹² = 856467853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 856471949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856471939) 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, 22538717 + ... + 22538754.

It is an arithmetic number, because the mean of its divisors is an integer number (225387360).

Almost surely, 2^856471949 is an apocalyptic number.

It is an amenable number.

856471949 is a deficient number, since it is larger than the sum of its proper divisors (45077491).

856471949 is a wasteful number, since it uses less digits than its factorization.

856471949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45077490.

The product of its digits is 2177280, while the sum is 53.

The square root of 856471949 is about 29265.5420076239. The cubic root of 856471949 is about 949.6663459874. Note that the first 3 decimals are identical.

The spelling of 856471949 in words is "eight hundred fifty-six million, four hundred seventy-one thousand, nine hundred forty-nine".