231401320405 has 4 divisors (see below), whose sum is σ = 277681584492. Its totient is φ = 185121056320.

The previous prime is 231401320387. The next prime is 231401320459. The reversal of 231401320405 is 504023104132.

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 49371951204 + 182029369201 = 222198^2 + 426649^2 .

It is not a de Polignac number, because 231401320405 - 2³⁵ = 197041582037 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 231401320405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23140132036 + ... + 23140132045.

It is an arithmetic number, because the mean of its divisors is an integer number (69420396123).

Almost surely, 2^231401320405 is an apocalyptic number.

It is an amenable number.

231401320405 is a deficient number, since it is larger than the sum of its proper divisors (46280264087).

231401320405 is an equidigital number, since it uses as much as digits as its factorization.

231401320405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46280264086.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 231401320405 its reverse (504023104132), we get a palindrome (735424424537).

The spelling of 231401320405 in words is "two hundred thirty-one billion, four hundred one million, three hundred twenty thousand, four hundred five".