1224720019 has 2 divisors, whose sum is σ = 1224720020. Its totient is φ = 1224720018.

The previous prime is 1224719999. The next prime is 1224720037. The reversal of 1224720019 is 9100274221.

It is a strong prime.

It is an emirp because it is prime and its reverse (9100274221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1224720019 - 2⁵ = 1224719987 is a prime.

It is a super-2 number, since 2×1224720019² = 2999878249878720722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1224720089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612360009 + 612360010.

It is an arithmetic number, because the mean of its divisors is an integer number (612360010).

Almost surely, 2^1224720019 is an apocalyptic number.

1224720019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224720019 is an equidigital number, since it uses as much as digits as its factorization.

1224720019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1224720019 is about 34996.0000428620. Note that the first 4 decimals coincide. The cubic root of 1224720019 is about 1069.9059570301.

The spelling of 1224720019 in words is "one billion, two hundred twenty-four million, seven hundred twenty thousand, nineteen".