205203155231 has 4 divisors (see below), whose sum is σ = 205204925592. Its totient is φ = 205201384872.

The previous prime is 205203155191. The next prime is 205203155281. The reversal of 205203155231 is 132551302502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132551302502 = 2 ⋅66275651251.

It is a cyclic number.

It is not a de Polignac number, because 205203155231 - 2⁶ = 205203155167 is a prime.

It is a super-2 number, since 2×205203155231² (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 = 205203155194 and 205203155203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205203155281) 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 3 ways as a sum of consecutive naturals, for example, 698141 + ... + 947526.

It is an arithmetic number, because the mean of its divisors is an integer number (51301231398).

Almost surely, 2^205203155231 is an apocalyptic number.

205203155231 is a deficient number, since it is larger than the sum of its proper divisors (1770361).

205203155231 is a wasteful number, since it uses less digits than its factorization.

205203155231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770360.

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 205203155231 its reverse (132551302502), we get a palindrome (337754457733).

The spelling of 205203155231 in words is "two hundred five billion, two hundred three million, one hundred fifty-five thousand, two hundred thirty-one".