231133261 has 2 divisors, whose sum is σ = 231133262. Its totient is φ = 231133260.

The previous prime is 231133237. The next prime is 231133283. The reversal of 231133261 is 162331132.

231133261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (231133283) can be obtained adding 231133261 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230857636 + 275625 = 15194^2 + 525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231133261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231133211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115566630 + 115566631.

It is an arithmetic number, because the mean of its divisors is an integer number (115566631).

Almost surely, 2^231133261 is an apocalyptic number.

It is an amenable number.

231133261 is a deficient number, since it is larger than the sum of its proper divisors (1).

231133261 is an equidigital number, since it uses as much as digits as its factorization.

231133261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 22.

The square root of 231133261 is about 15203.0674865305. The cubic root of 231133261 is about 613.6972100057.

Adding to 231133261 its reverse (162331132), we get a palindrome (393464393).

The spelling of 231133261 in words is "two hundred thirty-one million, one hundred thirty-three thousand, two hundred sixty-one".