1205143451 has 2 divisors, whose sum is σ = 1205143452. Its totient is φ = 1205143450.

The previous prime is 1205143409. The next prime is 1205143453. The reversal of 1205143451 is 1543415021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205143451 is a prime.

Together with 1205143453, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1205143451.

It is not a weakly prime, because it can be changed into another prime (1205143453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602571725 + 602571726.

It is an arithmetic number, because the mean of its divisors is an integer number (602571726).

Almost surely, 2^1205143451 is an apocalyptic number.

1205143451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205143451 is an equidigital number, since it uses as much as digits as its factorization.

1205143451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1205143451 is about 34715.1760905803. The cubic root of 1205143451 is about 1064.1746641082.

Adding to 1205143451 its reverse (1543415021), we get a palindrome (2748558472).

The spelling of 1205143451 in words is "one billion, two hundred five million, one hundred forty-three thousand, four hundred fifty-one".