856641441 has 16 divisors (see below), whose sum is σ = 1213337664. Its totient is φ = 535739904.

The previous prime is 856641403. The next prime is 856641479. The reversal of 856641441 is 144146658.

It is an interprime number because it is at equal distance from previous prime (856641403) and next prime (856641479).

It is not a de Polignac number, because 856641441 - 2¹⁰ = 856640417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856641441.

It is not an unprimeable number, because it can be changed into a prime (856641041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11700 + ... + 43013.

It is an arithmetic number, because the mean of its divisors is an integer number (75833604).

Almost surely, 2^856641441 is an apocalyptic number.

It is an amenable number.

856641441 is a deficient number, since it is larger than the sum of its proper divisors (356696223).

856641441 is a wasteful number, since it uses less digits than its factorization.

856641441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55040.

The product of its digits is 92160, while the sum is 39.

The square root of 856641441 is about 29268.4376248545. The cubic root of 856641441 is about 949.7289867747.

The spelling of 856641441 in words is "eight hundred fifty-six million, six hundred forty-one thousand, four hundred forty-one".