1213620409 has 2 divisors, whose sum is σ = 1213620410. Its totient is φ = 1213620408.

The previous prime is 1213620337. The next prime is 1213620413. The reversal of 1213620409 is 9040263121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1211248809 + 2371600 = 34803^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213620409 - 2⁷ = 1213620281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213623409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606810204 + 606810205.

It is an arithmetic number, because the mean of its divisors is an integer number (606810205).

Almost surely, 2^1213620409 is an apocalyptic number.

It is an amenable number.

1213620409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213620409 is an equidigital number, since it uses as much as digits as its factorization.

1213620409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1213620409 is about 34837.0551137722. The cubic root of 1213620409 is about 1066.6639653035.

The spelling of 1213620409 in words is "one billion, two hundred thirteen million, six hundred twenty thousand, four hundred nine".