205016431 has 2 divisors, whose sum is σ = 205016432. Its totient is φ = 205016430.

The previous prime is 205016429. The next prime is 205016437. The reversal of 205016431 is 134610502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205016431 - 2¹ = 205016429 is a prime.

It is a super-2 number, since 2×205016431² = 84063473959955522, which contains 22 as substring.

Together with 205016429, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205016437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102508215 + 102508216.

It is an arithmetic number, because the mean of its divisors is an integer number (102508216).

Almost surely, 2^205016431 is an apocalyptic number.

205016431 is a deficient number, since it is larger than the sum of its proper divisors (1).

205016431 is an equidigital number, since it uses as much as digits as its factorization.

205016431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 205016431 is about 14318.3948471887. The cubic root of 205016431 is about 589.6526069471.

Adding to 205016431 its reverse (134610502), we get a palindrome (339626933).

It can be divided in two parts, 2050 and 16431, that added together give a palindrome (18481).

The spelling of 205016431 in words is "two hundred five million, sixteen thousand, four hundred thirty-one".