231201409 has 2 divisors, whose sum is σ = 231201410. Its totient is φ = 231201408.

The previous prime is 231201403. The next prime is 231201431. The reversal of 231201409 is 904102132.

It is an a-pointer prime, because the next prime (231201431) can be obtained adding 231201409 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204575809 + 26625600 = 14303^2 + 5160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231201409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231201409.

It is not a weakly prime, because it can be changed into another prime (231201403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115600704 + 115600705.

It is an arithmetic number, because the mean of its divisors is an integer number (115600705).

Almost surely, 2^231201409 is an apocalyptic number.

It is an amenable number.

231201409 is a deficient number, since it is larger than the sum of its proper divisors (1).

231201409 is an equidigital number, since it uses as much as digits as its factorization.

231201409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 231201409 is about 15205.3085795718. The cubic root of 231201409 is about 613.7575188331.

The spelling of 231201409 in words is "two hundred thirty-one million, two hundred one thousand, four hundred nine".