235641 has 16 divisors (see below), whose sum is σ = 368000. Its totient is φ = 134064.

The previous prime is 235621. The next prime is 235661. The reversal of 235641 is 146532.

It is a happy number.

235641 is a nontrivial binomial coefficient, being equal to C(687, 2).

It is an interprime number because it is at equal distance from previous prime (235621) and next prime (235661).

It is not a de Polignac number, because 235641 - 2⁶ = 235577 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

235641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (235601) 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, 915 + ... + 1143.

It is an arithmetic number, because the mean of its divisors is an integer number (23000).

2²³⁵⁶⁴¹ is an apocalyptic number.

235641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

235641 is the 686-th triangular number.

It is an amenable number.

235641 is a deficient number, since it is larger than the sum of its proper divisors (132359).

235641 is an equidigital number, since it uses as much as digits as its factorization.

235641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 239 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 235641 is about 485.4286765324. The cubic root of 235641 is about 61.7661150005.

The spelling of 235641 in words is "two hundred thirty-five thousand, six hundred forty-one".