235868981 has 4 divisors (see below), whose sum is σ = 238073472. Its totient is φ = 233664492.

The previous prime is 235868959. The next prime is 235868989. The reversal of 235868981 is 189868532.

235868981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 235868981 - 2⁶ = 235868917 is a prime.

It is a super-2 number, since 2×235868981² = 111268352395956722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (235868989) 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, 1102085 + ... + 1102298.

It is an arithmetic number, because the mean of its divisors is an integer number (59518368).

Almost surely, 2^235868981 is an apocalyptic number.

It is an amenable number.

235868981 is a deficient number, since it is larger than the sum of its proper divisors (2204491).

235868981 is a wasteful number, since it uses less digits than its factorization.

235868981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204490.

The product of its digits is 829440, while the sum is 50.

The square root of 235868981 is about 15358.0265984924. The cubic root of 235868981 is about 617.8602800641.

The spelling of 235868981 in words is "two hundred thirty-five million, eight hundred sixty-eight thousand, nine hundred eighty-one".