1235205019 has 2 divisors, whose sum is σ = 1235205020. Its totient is φ = 1235205018.

The previous prime is 1235205017. The next prime is 1235205047. The reversal of 1235205019 is 9105025321.

It is an a-pointer prime, because the next prime (1235205047) can be obtained adding 1235205019 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1235205019 - 2¹ = 1235205017 is a prime.

It is a super-2 number, since 2×1235205019² = 3051462877925580722, which contains 22 as substring.

Together with 1235205017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1235205017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617602509 + 617602510.

It is an arithmetic number, because the mean of its divisors is an integer number (617602510).

Almost surely, 2^1235205019 is an apocalyptic number.

1235205019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235205019 is an equidigital number, since it uses as much as digits as its factorization.

1235205019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 1235205019 is about 35145.4836216547. The cubic root of 1235205019 is about 1072.9504902913.

The spelling of 1235205019 in words is "one billion, two hundred thirty-five million, two hundred five thousand, nineteen".