1821752993 has 2 divisors, whose sum is σ = 1821752994. Its totient is φ = 1821752992.

The previous prime is 1821752987. The next prime is 1821753029. The reversal of 1821752993 is 3992571281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1812800929 + 8952064 = 42577^2 + 2992^2 .

It is a cyclic number.

It is not a de Polignac number, because 1821752993 - 2¹⁰ = 1821751969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1821752903) 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, 910876496 + 910876497.

It is an arithmetic number, because the mean of its divisors is an integer number (910876497).

Almost surely, 2^1821752993 is an apocalyptic number.

It is an amenable number.

1821752993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821752993 is an equidigital number, since it uses as much as digits as its factorization.

1821752993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 1821752993 is about 42681.9984653952. The cubic root of 1821752993 is about 1221.3210166809.

The spelling of 1821752993 in words is "one billion, eight hundred twenty-one million, seven hundred fifty-two thousand, nine hundred ninety-three".