1822209989 has 2 divisors, whose sum is σ = 1822209990. Its totient is φ = 1822209988.

The previous prime is 1822209947. The next prime is 1822209997. The reversal of 1822209989 is 9899022281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1820728900 + 1481089 = 42670^2 + 1217^2 .

It is an emirp because it is prime and its reverse (9899022281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1822209989 - 2¹⁶ = 1822144453 is a prime.

It is a super-2 number, since 2×1822209989² = 6640898488022760242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1822209089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911104994 + 911104995.

It is an arithmetic number, because the mean of its divisors is an integer number (911104995).

Almost surely, 2^1822209989 is an apocalyptic number.

It is an amenable number.

1822209989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1822209989 is an equidigital number, since it uses as much as digits as its factorization.

1822209989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 1822209989 is about 42687.3516278534. The cubic root of 1822209989 is about 1221.4231330046.

The spelling of 1822209989 in words is "one billion, eight hundred twenty-two million, two hundred nine thousand, nine hundred eighty-nine".