1780804513 has 2 divisors, whose sum is σ = 1780804514. Its totient is φ = 1780804512.

The previous prime is 1780804489. The next prime is 1780804523. The reversal of 1780804513 is 3154080871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 945132049 + 835672464 = 30743^2 + 28908^2 .

It is a cyclic number.

It is not a de Polignac number, because 1780804513 - 2⁵ = 1780804481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1780804523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890402256 + 890402257.

It is an arithmetic number, because the mean of its divisors is an integer number (890402257).

Almost surely, 2^1780804513 is an apocalyptic number.

It is an amenable number.

1780804513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1780804513 is an equidigital number, since it uses as much as digits as its factorization.

1780804513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 1780804513 is about 42199.5795358200. The cubic root of 1780804513 is about 1212.1008316250.

The spelling of 1780804513 in words is "one billion, seven hundred eighty million, eight hundred four thousand, five hundred thirteen".