856520741 has 32 divisors (see below), whose sum is σ = 989936640. Its totient is φ = 735969024.

The previous prime is 856520723. The next prime is 856520803. The reversal of 856520741 is 147025658.

It is a cyclic number.

It is not a de Polignac number, because 856520741 - 2¹⁰ = 856519717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 856520695 and 856520704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856520701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1152416 + ... + 1153158.

It is an arithmetic number, because the mean of its divisors is an integer number (30935520).

Almost surely, 2^856520741 is an apocalyptic number.

It is an amenable number.

856520741 is a deficient number, since it is larger than the sum of its proper divisors (133415899).

856520741 is a wasteful number, since it uses less digits than its factorization.

856520741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 856520741 is about 29266.3756040956. The cubic root of 856520741 is about 949.6843793628.

The spelling of 856520741 in words is "eight hundred fifty-six million, five hundred twenty thousand, seven hundred forty-one".