235561 has 4 divisors (see below), whose sum is σ = 237952. Its totient is φ = 233172.

The previous prime is 235559. The next prime is 235577. The reversal of 235561 is 165532.

It is a happy number.

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 235561 - 2¹ = 235559 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (235541) 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, 1041 + ... + 1246.

It is an arithmetic number, because the mean of its divisors is an integer number (59488).

2²³⁵⁵⁶¹ is an apocalyptic number.

It is an amenable number.

235561 is a deficient number, since it is larger than the sum of its proper divisors (2391).

235561 is a wasteful number, since it uses less digits than its factorization.

235561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390.

The product of its digits is 900, while the sum is 22.

The square root of 235561 is about 485.3462681427. The cubic root of 235561 is about 61.7591243545.

The spelling of 235561 in words is "two hundred thirty-five thousand, five hundred sixty-one".