1313560021 has 2 divisors, whose sum is σ = 1313560022. Its totient is φ = 1313560020.

The previous prime is 1313559997. The next prime is 1313560037. The reversal of 1313560021 is 1200653131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1236295921 + 77264100 = 35161^2 + 8790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313560021 - 2¹⁹ = 1313035733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1313559974 and 1313560001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313569021) 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, 656780010 + 656780011.

It is an arithmetic number, because the mean of its divisors is an integer number (656780011).

Almost surely, 2^1313560021 is an apocalyptic number.

It is an amenable number.

1313560021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313560021 is an equidigital number, since it uses as much as digits as its factorization.

1313560021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1313560021 is about 36243.0685924909. The cubic root of 1313560021 is about 1095.1744600853.

The spelling of 1313560021 in words is "one billion, three hundred thirteen million, five hundred sixty thousand, twenty-one".