856513 has 8 divisors (see below), whose sum is σ = 1005632. Its totient is φ = 714096.

The previous prime is 856507. The next prime is 856519. The reversal of 856513 is 315658.

It is an interprime number because it is at equal distance from previous prime (856507) and next prime (856519).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856513 - 2¹³ = 848321 is a prime.

It is a super-2 number, since 2×856513² = 1467229038338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1395 + ... + 1912.

It is an arithmetic number, because the mean of its divisors is an integer number (125704).

2⁸⁵⁶⁵¹³ is an apocalyptic number.

It is an amenable number.

856513 is a deficient number, since it is larger than the sum of its proper divisors (149119).

856513 is a wasteful number, since it uses less digits than its factorization.

856513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3351.

The product of its digits is 3600, while the sum is 28.

The square root of 856513 is about 925.4798755240. The cubic root of 856513 is about 94.9681518358.

It can be divided in two parts, 856 and 513, that added together give a square (1369 = 37²).

The spelling of 856513 in words is "eight hundred fifty-six thousand, five hundred thirteen".