1204142509 has 2 divisors, whose sum is σ = 1204142510. Its totient is φ = 1204142508.

The previous prime is 1204142507. The next prime is 1204142531. The reversal of 1204142509 is 9052414021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 669515625 + 534626884 = 25875^2 + 23122^2 .

It is a cyclic number.

It is not a de Polignac number, because 1204142509 - 2¹ = 1204142507 is a prime.

Together with 1204142507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1204142507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602071254 + 602071255.

It is an arithmetic number, because the mean of its divisors is an integer number (602071255).

Almost surely, 2^1204142509 is an apocalyptic number.

It is an amenable number.

1204142509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204142509 is an equidigital number, since it uses as much as digits as its factorization.

1204142509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1204142509 is about 34700.7566055843. The cubic root of 1204142509 is about 1063.8799627736.

The spelling of 1204142509 in words is "one billion, two hundred four million, one hundred forty-two thousand, five hundred nine".