205144401251 has 2 divisors, whose sum is σ = 205144401252. Its totient is φ = 205144401250.

The previous prime is 205144401233. The next prime is 205144401277. The reversal of 205144401251 is 152104441502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205144401251 is a prime.

It is not a weakly prime, because it can be changed into another prime (205144401281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102572200625 + 102572200626.

It is an arithmetic number, because the mean of its divisors is an integer number (102572200626).

Almost surely, 2^205144401251 is an apocalyptic number.

205144401251 is a deficient number, since it is larger than the sum of its proper divisors (1).

205144401251 is an equidigital number, since it uses as much as digits as its factorization.

205144401251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 205144401251 its reverse (152104441502), we get a palindrome (357248842753).

The spelling of 205144401251 in words is "two hundred five billion, one hundred forty-four million, four hundred one thousand, two hundred fifty-one".