1820748497 has 2 divisors, whose sum is σ = 1820748498. Its totient is φ = 1820748496.

The previous prime is 1820748469. The next prime is 1820748509. The reversal of 1820748497 is 7948470281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1737555856 + 83192641 = 41684^2 + 9121^2 .

It is an emirp because it is prime and its reverse (7948470281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1820748497 - 2¹⁰ = 1820747473 is a prime.

It is not a weakly prime, because it can be changed into another prime (1820748197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910374248 + 910374249.

It is an arithmetic number, because the mean of its divisors is an integer number (910374249).

Almost surely, 2^1820748497 is an apocalyptic number.

It is an amenable number.

1820748497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820748497 is an equidigital number, since it uses as much as digits as its factorization.

1820748497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 903168, while the sum is 50.

The square root of 1820748497 is about 42670.2296337857. The cubic root of 1820748497 is about 1221.0965007643.

The spelling of 1820748497 in words is "one billion, eight hundred twenty million, seven hundred forty-eight thousand, four hundred ninety-seven".