231664133 has 4 divisors (see below), whose sum is σ = 232404588. Its totient is φ = 230923680.

The previous prime is 231664109. The next prime is 231664159. The reversal of 231664133 is 331466132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64272289 + 167391844 = 8017^2 + 12938^2 .

It is a cyclic number.

It is not a de Polignac number, because 231664133 - 2⁸ = 231663877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231664096 and 231664105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231664163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369758 + ... + 370383.

It is an arithmetic number, because the mean of its divisors is an integer number (58101147).

Almost surely, 2^231664133 is an apocalyptic number.

It is an amenable number.

231664133 is a deficient number, since it is larger than the sum of its proper divisors (740455).

231664133 is an equidigital number, since it uses as much as digits as its factorization.

231664133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740454.

The product of its digits is 7776, while the sum is 29.

The square root of 231664133 is about 15220.5168440497. The cubic root of 231664133 is about 614.1667018634.

The spelling of 231664133 in words is "two hundred thirty-one million, six hundred sixty-four thousand, one hundred thirty-three".