231510133 has 2 divisors, whose sum is σ = 231510134. Its totient is φ = 231510132.

The previous prime is 231510127. The next prime is 231510179. The reversal of 231510133 is 331015132.

231510133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146095569 + 85414564 = 12087^2 + 9242^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231510133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231510133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231510733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115755066 + 115755067.

It is an arithmetic number, because the mean of its divisors is an integer number (115755067).

Almost surely, 2^231510133 is an apocalyptic number.

It is an amenable number.

231510133 is a deficient number, since it is larger than the sum of its proper divisors (1).

231510133 is an equidigital number, since it uses as much as digits as its factorization.

231510133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 231510133 is about 15215.4570421003. The cubic root of 231510133 is about 614.0305814715.

Adding to 231510133 its reverse (331015132), we get a palindrome (562525265).

The spelling of 231510133 in words is "two hundred thirty-one million, five hundred ten thousand, one hundred thirty-three".