856121473 has 4 divisors (see below), whose sum is σ = 857142720. Its totient is φ = 855100228.

The previous prime is 856121459. The next prime is 856121501. The reversal of 856121473 is 374121658.

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, and also an emirpimes, since its reverse is a distinct semiprime: 374121658 = 2 ⋅187060829.

It is a cyclic number.

It is not a de Polignac number, because 856121473 - 2⁹ = 856120961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856124473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509365 + ... + 511042.

It is an arithmetic number, because the mean of its divisors is an integer number (214285680).

Almost surely, 2^856121473 is an apocalyptic number.

It is an amenable number.

856121473 is a deficient number, since it is larger than the sum of its proper divisors (1021247).

856121473 is a wasteful number, since it uses less digits than its factorization.

856121473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021246.

The product of its digits is 40320, while the sum is 37.

The square root of 856121473 is about 29259.5535338460. The cubic root of 856121473 is about 949.5367909865.

The spelling of 856121473 in words is "eight hundred fifty-six million, one hundred twenty-one thousand, four hundred seventy-three".