231281081 has 2 divisors, whose sum is σ = 231281082. Its totient is φ = 231281080.

The previous prime is 231281033. The next prime is 231281093. The reversal of 231281081 is 180182132.

231281081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231040000 + 241081 = 15200^2 + 491^2 .

It is a cyclic number.

It is not a de Polignac number, because 231281081 - 2¹⁴ = 231264697 is a prime.

It is a super-2 number, since 2×231281081² = 106981876857057122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231281081.

It is not a weakly prime, because it can be changed into another prime (231281381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115640540 + 115640541.

It is an arithmetic number, because the mean of its divisors is an integer number (115640541).

Almost surely, 2^231281081 is an apocalyptic number.

It is an amenable number.

231281081 is a deficient number, since it is larger than the sum of its proper divisors (1).

231281081 is an equidigital number, since it uses as much as digits as its factorization.

231281081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 231281081 is about 15207.9282283946. The cubic root of 231281081 is about 613.8280110119.

The spelling of 231281081 in words is "two hundred thirty-one million, two hundred eighty-one thousand, eighty-one".