231266381 has 4 divisors (see below), whose sum is σ = 231326172. Its totient is φ = 231206592.

The previous prime is 231266369. The next prime is 231266459. The reversal of 231266381 is 183662132.

231266381 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 60310756 + 170955625 = 7766^2 + 13075^2 .

It is a cyclic number.

It is not a de Polignac number, because 231266381 - 2¹⁰ = 231265357 is a prime.

It is a super-2 number, since 2×231266381² = 106968277961674322, 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 (231266681) 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, 23660 + ... + 31973.

It is an arithmetic number, because the mean of its divisors is an integer number (57831543).

Almost surely, 2^231266381 is an apocalyptic number.

It is an amenable number.

231266381 is a deficient number, since it is larger than the sum of its proper divisors (59791).

231266381 is an equidigital number, since it uses as much as digits as its factorization.

231266381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59790.

The product of its digits is 10368, while the sum is 32.

The square root of 231266381 is about 15207.4449201699. Note that the first 3 decimals coincide. The cubic root of 231266381 is about 613.8150059664.

The spelling of 231266381 in words is "two hundred thirty-one million, two hundred sixty-six thousand, three hundred eighty-one".