1820319493 has 2 divisors, whose sum is σ = 1820319494. Its totient is φ = 1820319492.

The previous prime is 1820319481. The next prime is 1820319499. The reversal of 1820319493 is 3949130281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1812800929 + 7518564 = 42577^2 + 2742^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820319493 - 2⁵ = 1820319461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820319499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910159746 + 910159747.

It is an arithmetic number, because the mean of its divisors is an integer number (910159747).

Almost surely, 2^1820319493 is an apocalyptic number.

It is an amenable number.

1820319493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820319493 is an equidigital number, since it uses as much as digits as its factorization.

1820319493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 1820319493 is about 42665.2023668000. The cubic root of 1820319493 is about 1221.0005884819. Note that the first 3 decimals are identical.

The spelling of 1820319493 in words is "one billion, eight hundred twenty million, three hundred nineteen thousand, four hundred ninety-three".