231303133 has 2 divisors, whose sum is σ = 231303134. Its totient is φ = 231303132.

The previous prime is 231303119. The next prime is 231303151. The reversal of 231303133 is 331303132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161112249 + 70190884 = 12693^2 + 8378^2 .

It is a cyclic number.

It is not a de Polignac number, because 231303133 - 2¹³ = 231294941 is a prime.

It is a super-2 number, since 2×231303133² = 107002278671231378, 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 231303133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231303103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115651566 + 115651567.

It is an arithmetic number, because the mean of its divisors is an integer number (115651567).

Almost surely, 2^231303133 is an apocalyptic number.

It is an amenable number.

231303133 is a deficient number, since it is larger than the sum of its proper divisors (1).

231303133 is an equidigital number, since it uses as much as digits as its factorization.

231303133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 19.

The square root of 231303133 is about 15208.6532276859. The cubic root of 231303133 is about 613.8475193162.

Adding to 231303133 its reverse (331303132), we get a palindrome (562606265).

Subtracting 231303133 from its reverse (331303132), we obtain a palindrome (99999999).

The spelling of 231303133 in words is "two hundred thirty-one million, three hundred three thousand, one hundred thirty-three".