231433681 has 4 divisors (see below), whose sum is σ = 231819364. Its totient is φ = 231048000.

The previous prime is 231433679. The next prime is 231433711. The reversal of 231433681 is 186334132.

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 207619281 + 23814400 = 14409^2 + 4880^2 .

It is a cyclic number.

It is not a de Polignac number, because 231433681 - 2¹ = 231433679 is a prime.

It is a super-2 number, since 2×231433681² = 107123097402419522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231433621) 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, 191940 + ... + 193141.

It is an arithmetic number, because the mean of its divisors is an integer number (57954841).

Almost surely, 2^231433681 is an apocalyptic number.

It is an amenable number.

231433681 is a deficient number, since it is larger than the sum of its proper divisors (385683).

231433681 is an equidigital number, since it uses as much as digits as its factorization.

231433681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385682.

The product of its digits is 10368, while the sum is 31.

The square root of 231433681 is about 15212.9445210321. The cubic root of 231433681 is about 613.9629832289.

The spelling of 231433681 in words is "two hundred thirty-one million, four hundred thirty-three thousand, six hundred eighty-one".