1305320251 has 2 divisors, whose sum is σ = 1305320252. Its totient is φ = 1305320250.

The previous prime is 1305320243. The next prime is 1305320257. The reversal of 1305320251 is 1520235031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1305320251 - 2³ = 1305320243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1305320257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652660125 + 652660126.

It is an arithmetic number, because the mean of its divisors is an integer number (652660126).

Almost surely, 2^1305320251 is an apocalyptic number.

1305320251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305320251 is an equidigital number, since it uses as much as digits as its factorization.

1305320251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 1305320251 is about 36129.2160307970. The cubic root of 1305320251 is about 1092.8796987084.

Adding to 1305320251 its reverse (1520235031), we get a palindrome (2825555282).

The spelling of 1305320251 in words is "one billion, three hundred five million, three hundred twenty thousand, two hundred fifty-one".