1821660713 has 2 divisors, whose sum is σ = 1821660714. Its totient is φ = 1821660712.

The previous prime is 1821660707. The next prime is 1821660727. The reversal of 1821660713 is 3170661281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995213209 + 826447504 = 31547^2 + 28748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1821660713 - 2¹⁴ = 1821644329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1821660793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910830356 + 910830357.

It is an arithmetic number, because the mean of its divisors is an integer number (910830357).

Almost surely, 2^1821660713 is an apocalyptic number.

It is an amenable number.

1821660713 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821660713 is an equidigital number, since it uses as much as digits as its factorization.

1821660713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1821660713 is about 42680.9174339072. The cubic root of 1821660713 is about 1221.3003945279.

The spelling of 1821660713 in words is "one billion, eight hundred twenty-one million, six hundred sixty thousand, seven hundred thirteen".