1799790521 has 2 divisors, whose sum is σ = 1799790522. Its totient is φ = 1799790520.

The previous prime is 1799790497. The next prime is 1799790539. The reversal of 1799790521 is 1250979971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1508234896 + 291555625 = 38836^2 + 17075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1799790521 - 2¹⁸ = 1799528377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1799790521.

It is not a weakly prime, because it can be changed into another prime (1799790541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899895260 + 899895261.

It is an arithmetic number, because the mean of its divisors is an integer number (899895261).

Almost surely, 2^1799790521 is an apocalyptic number.

It is an amenable number.

1799790521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1799790521 is an equidigital number, since it uses as much as digits as its factorization.

1799790521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 357210, while the sum is 50.

The square root of 1799790521 is about 42423.9380656723. The cubic root of 1799790521 is about 1216.3932086325.

The spelling of 1799790521 in words is "one billion, seven hundred ninety-nine million, seven hundred ninety thousand, five hundred twenty-one".