1313225521 has 2 divisors, whose sum is σ = 1313225522. Its totient is φ = 1313225520.

The previous prime is 1313225519. The next prime is 1313225579. The reversal of 1313225521 is 1255223131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1144874896 + 168350625 = 33836^2 + 12975^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313225521 - 2¹ = 1313225519 is a prime.

It is a super-2 number, since 2×1313225521² = 3449122538011442882, which contains 22 as substring.

Together with 1313225519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1313225591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656612760 + 656612761.

It is an arithmetic number, because the mean of its divisors is an integer number (656612761).

Almost surely, 2^1313225521 is an apocalyptic number.

It is an amenable number.

1313225521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313225521 is an equidigital number, since it uses as much as digits as its factorization.

1313225521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 1313225521 is about 36238.4536231887. The cubic root of 1313225521 is about 1095.0814895951.

Adding to 1313225521 its reverse (1255223131), we get a palindrome (2568448652).

The spelling of 1313225521 in words is "one billion, three hundred thirteen million, two hundred twenty-five thousand, five hundred twenty-one".