231409 has 2 divisors, whose sum is σ = 231410. Its totient is φ = 231408.

The previous prime is 231379. The next prime is 231419. The reversal of 231409 is 904132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138384 + 93025 = 372^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 231409 - 2¹³ = 223217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115704 + 115705.

It is an arithmetic number, because the mean of its divisors is an integer number (115705).

2²³¹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

231409 is a deficient number, since it is larger than the sum of its proper divisors (1).

231409 is an equidigital number, since it uses as much as digits as its factorization.

231409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 231409 is about 481.0498934622. The cubic root of 231409 is about 61.3941157309.

The spelling of 231409 in words is "two hundred thirty-one thousand, four hundred nine".