231002281 has 2 divisors, whose sum is σ = 231002282. Its totient is φ = 231002280.

The previous prime is 231002269. The next prime is 231002329. The reversal of 231002281 is 182200132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161696656 + 69305625 = 12716^2 + 8325^2 .

It is a cyclic number.

It is not a de Polignac number, because 231002281 - 2⁷ = 231002153 is a prime.

It is a super-2 number, since 2×231002281² = 106724107654405922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231002201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115501140 + 115501141.

It is an arithmetic number, because the mean of its divisors is an integer number (115501141).

Almost surely, 2^231002281 is an apocalyptic number.

It is an amenable number.

231002281 is a deficient number, since it is larger than the sum of its proper divisors (1).

231002281 is an equidigital number, since it uses as much as digits as its factorization.

231002281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 231002281 is about 15198.7591927762. The cubic root of 231002281 is about 613.5812635472.

The spelling of 231002281 in words is "two hundred thirty-one million, two thousand, two hundred eighty-one".