205054640431 has 2 divisors, whose sum is σ = 205054640432. Its totient is φ = 205054640430.

The previous prime is 205054640393. The next prime is 205054640491. The reversal of 205054640431 is 134046450502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205054640431 - 2¹⁵ = 205054607663 is a prime.

It is a super-2 number, since 2×205054640431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205054640491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102527320215 + 102527320216.

It is an arithmetic number, because the mean of its divisors is an integer number (102527320216).

Almost surely, 2^205054640431 is an apocalyptic number.

205054640431 is a deficient number, since it is larger than the sum of its proper divisors (1).

205054640431 is an equidigital number, since it uses as much as digits as its factorization.

205054640431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 34.

The spelling of 205054640431 in words is "two hundred five billion, fifty-four million, six hundred forty thousand, four hundred thirty-one".