231711409 has 2 divisors, whose sum is σ = 231711410. Its totient is φ = 231711408.

The previous prime is 231711397. The next prime is 231711413. The reversal of 231711409 is 904117132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172344384 + 59367025 = 13128^2 + 7705^2 .

It is a cyclic number.

It is not a de Polignac number, because 231711409 - 2⁷ = 231711281 is a prime.

It is not a weakly prime, because it can be changed into another prime (231711419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115855704 + 115855705.

It is an arithmetic number, because the mean of its divisors is an integer number (115855705).

Almost surely, 2^231711409 is an apocalyptic number.

It is an amenable number.

231711409 is a deficient number, since it is larger than the sum of its proper divisors (1).

231711409 is an equidigital number, since it uses as much as digits as its factorization.

231711409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 231711409 is about 15222.0698001290. The cubic root of 231711409 is about 614.2084769536.

The spelling of 231711409 in words is "two hundred thirty-one million, seven hundred eleven thousand, four hundred nine".