205454232431 has 24 divisors (see below), whose sum is σ = 243067728384. Its totient is φ = 173108335680.

The previous prime is 205454232397. The next prime is 205454232437. The reversal of 205454232431 is 134232454502.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-205454232431 is a prime.

It is a super-2 number, since 2×205454232431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205454232391 and 205454232400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205454232437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4950041 + ... + 4991373.

It is an arithmetic number, because the mean of its divisors is an integer number (10127822016).

Almost surely, 2^205454232431 is an apocalyptic number.

205454232431 is a deficient number, since it is larger than the sum of its proper divisors (37613495953).

205454232431 is a wasteful number, since it uses less digits than its factorization.

205454232431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43071 (or 43064 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 205454232431 its reverse (134232454502), we get a palindrome (339686686933).

The spelling of 205454232431 in words is "two hundred five billion, four hundred fifty-four million, two hundred thirty-two thousand, four hundred thirty-one".