1821492193 has 2 divisors, whose sum is σ = 1821492194. Its totient is φ = 1821492192.

The previous prime is 1821492143. The next prime is 1821492223. The reversal of 1821492193 is 3912941281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1116695889 + 704796304 = 33417^2 + 26548^2 .

It is an emirp because it is prime and its reverse (3912941281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1821492193 - 2²⁵ = 1787937761 is a prime.

It is not a weakly prime, because it can be changed into another prime (1821492143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910746096 + 910746097.

It is an arithmetic number, because the mean of its divisors is an integer number (910746097).

Almost surely, 2^1821492193 is an apocalyptic number.

It is an amenable number.

1821492193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821492193 is an equidigital number, since it uses as much as digits as its factorization.

1821492193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 1821492193 is about 42678.9432038798. The cubic root of 1821492193 is about 1221.2627329429.

The spelling of 1821492193 in words is "one billion, eight hundred twenty-one million, four hundred ninety-two thousand, one hundred ninety-three".