231442405 has 4 divisors (see below), whose sum is σ = 277730892. Its totient is φ = 185153920.

The previous prime is 231442349. The next prime is 231442411. The reversal of 231442405 is 504244132.

It is a happy number.

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 40947201 + 190495204 = 6399^2 + 13802^2 .

It is not a de Polignac number, because 231442405 - 2¹⁹ = 230918117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231442405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23144236 + ... + 23144245.

It is an arithmetic number, because the mean of its divisors is an integer number (69432723).

Almost surely, 2^231442405 is an apocalyptic number.

It is an amenable number.

231442405 is a deficient number, since it is larger than the sum of its proper divisors (46288487).

231442405 is an equidigital number, since it uses as much as digits as its factorization.

231442405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46288486.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 231442405 is about 15213.2312478316. The cubic root of 231442405 is about 613.9706976718.

Adding to 231442405 its reverse (504244132), we get a palindrome (735686537).

The spelling of 231442405 in words is "two hundred thirty-one million, four hundred forty-two thousand, four hundred five".