231746561 has 2 divisors, whose sum is σ = 231746562. Its totient is φ = 231746560.

The previous prime is 231746549. The next prime is 231746573. The reversal of 231746561 is 165647132.

It is a balanced prime because it is at equal distance from previous prime (231746549) and next prime (231746573).

It can be written as a sum of positive squares in only one way, i.e., 153760000 + 77986561 = 12400^2 + 8831^2 .

It is a cyclic number.

It is not a de Polignac number, because 231746561 - 2¹⁰ = 231745537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231746521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115873280 + 115873281.

It is an arithmetic number, because the mean of its divisors is an integer number (115873281).

Almost surely, 2^231746561 is an apocalyptic number.

It is an amenable number.

231746561 is a deficient number, since it is larger than the sum of its proper divisors (1).

231746561 is an equidigital number, since it uses as much as digits as its factorization.

231746561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 231746561 is about 15223.2243956397. The cubic root of 231746561 is about 614.2395350771.

The spelling of 231746561 in words is "two hundred thirty-one million, seven hundred forty-six thousand, five hundred sixty-one".