231941681 has 4 divisors (see below), whose sum is σ = 239939700. Its totient is φ = 223943664.

The previous prime is 231941669. The next prime is 231941711. The reversal of 231941681 is 186149132.

231941681 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.

It can be written as a sum of positive squares in 2 ways, for example, as 184552225 + 47389456 = 13585^2 + 6884^2 .

It is a cyclic number.

It is not a de Polignac number, because 231941681 - 2¹⁸ = 231679537 is a prime.

It is a super-4 number, since 4×231941681⁴ (a number of 35 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231941981) 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, 3998966 + ... + 3999023.

It is an arithmetic number, because the mean of its divisors is an integer number (59984925).

Almost surely, 2^231941681 is an apocalyptic number.

It is an amenable number.

231941681 is a deficient number, since it is larger than the sum of its proper divisors (7998019).

231941681 is an equidigital number, since it uses as much as digits as its factorization.

231941681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7998018.

The product of its digits is 10368, while the sum is 35.

The square root of 231941681 is about 15229.6316764392. The cubic root of 231941681 is about 614.4118739129.

The spelling of 231941681 in words is "two hundred thirty-one million, nine hundred forty-one thousand, six hundred eighty-one".