1305220531 has 2 divisors, whose sum is σ = 1305220532. Its totient is φ = 1305220530.

The previous prime is 1305220493. The next prime is 1305220571. The reversal of 1305220531 is 1350225031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1305220531 - 2¹¹ = 1305218483 is a prime.

It is a super-2 number, since 2×1305220531² = 3407201269087843922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1305220571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652610265 + 652610266.

It is an arithmetic number, because the mean of its divisors is an integer number (652610266).

Almost surely, 2^1305220531 is an apocalyptic number.

1305220531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305220531 is an equidigital number, since it uses as much as digits as its factorization.

1305220531 is an evil number, because the sum of its binary digits is even.

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

The square root of 1305220531 is about 36127.8359578871. The cubic root of 1305220531 is about 1092.8518678015.

Adding to 1305220531 its reverse (1350225031), we get a palindrome (2655445562).

The spelling of 1305220531 in words is "one billion, three hundred five million, two hundred twenty thousand, five hundred thirty-one".