231551431354409 has 2 divisors, whose sum is σ = 231551431354410. Its totient is φ = 231551431354408.

The previous prime is 231551431354379. The next prime is 231551431354513. The reversal of 231551431354409 is 904453134155132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152078717280400 + 79472714074009 = 12332020^2 + 8914747^2 .

It is a cyclic number.

It is not a de Polignac number, because 231551431354409 - 2³⁶ = 231482711877673 is a prime.

It is not a weakly prime, because it can be changed into another prime (231551431374409) by changing a digit.

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 as a sum of consecutive naturals, namely, 115775715677204 + 115775715677205.

It is an arithmetic number, because the mean of its divisors is an integer number (115775715677205).

Almost surely, 2^{231551431354409} is an apocalyptic number.

It is an amenable number.

231551431354409 is a deficient number, since it is larger than the sum of its proper divisors (1).

231551431354409 is an equidigital number, since it uses as much as digits as its factorization.

231551431354409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888000, while the sum is 50.

The spelling of 231551431354409 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, four hundred thirty-one million, three hundred fifty-four thousand, four hundred nine".