856511513 has 16 divisors (see below), whose sum is σ = 1050005376. Its totient is φ = 687498240.

The previous prime is 856511501. The next prime is 856511519. The reversal of 856511513 is 315115658.

It is not a de Polignac number, because 856511513 - 2⁴ = 856511497 is a prime.

It is a super-2 number, since 2×856511513² = 1467223943803098338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856511519) 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 15 ways as a sum of consecutive naturals, for example, 126920 + ... + 133497.

It is an arithmetic number, because the mean of its divisors is an integer number (65625336).

Almost surely, 2^856511513 is an apocalyptic number.

It is an amenable number.

856511513 is a deficient number, since it is larger than the sum of its proper divisors (193493863).

856511513 is a wasteful number, since it uses less digits than its factorization.

856511513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260464.

The product of its digits is 18000, while the sum is 35.

The square root of 856511513 is about 29266.2179483445. The cubic root of 856511513 is about 949.6809687745.

The spelling of 856511513 in words is "eight hundred fifty-six million, five hundred eleven thousand, five hundred thirteen".