853561 has 4 divisors (see below), whose sum is σ = 861952. Its totient is φ = 845172.

The previous prime is 853547. The next prime is 853571. The reversal of 853561 is 165358.

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.

It is a cyclic number.

It is not a de Polignac number, because 853561 - 2⁵ = 853529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4041 + ... + 4246.

It is an arithmetic number, because the mean of its divisors is an integer number (215488).

2⁸⁵³⁵⁶¹ is an apocalyptic number.

It is an amenable number.

853561 is a deficient number, since it is larger than the sum of its proper divisors (8391).

853561 is a wasteful number, since it uses less digits than its factorization.

853561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8390.

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

The square root of 853561 is about 923.8836506834. The cubic root of 853561 is about 94.8589226410.

The spelling of 853561 in words is "eight hundred fifty-three thousand, five hundred sixty-one".