1306180621 has 4 divisors (see below), whose sum is σ = 1313730972. Its totient is φ = 1298630272.

The previous prime is 1306180607. The next prime is 1306180633. The reversal of 1306180621 is 1260816031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 665382025 + 640798596 = 25795^2 + 25314^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306180621 - 2²⁵ = 1272626189 is a prime.

It is a super-2 number, since 2×1306180621² = 3412215629351891282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1306180621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306180651) 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 in 3 ways as a sum of consecutive naturals, for example, 3774916 + ... + 3775261.

It is an arithmetic number, because the mean of its divisors is an integer number (328432743).

Almost surely, 2^1306180621 is an apocalyptic number.

It is an amenable number.

1306180621 is a deficient number, since it is larger than the sum of its proper divisors (7550351).

1306180621 is an equidigital number, since it uses as much as digits as its factorization.

1306180621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7550350.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1306180621 is about 36141.1209151017. The cubic root of 1306180621 is about 1093.1197609698.

Adding to 1306180621 its reverse (1260816031), we get a palindrome (2566996652).

The spelling of 1306180621 in words is "one billion, three hundred six million, one hundred eighty thousand, six hundred twenty-one".