1205500019 has 2 divisors, whose sum is σ = 1205500020. Its totient is φ = 1205500018.

The previous prime is 1205500013. The next prime is 1205500033. The reversal of 1205500019 is 9100055021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1205500019 - 2⁴ = 1205500003 is a prime.

It is a super-2 number, since 2×1205500019² = 2906460591618000722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1205499967 and 1205500003.

It is not a weakly prime, because it can be changed into another prime (1205500013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602750009 + 602750010.

It is an arithmetic number, because the mean of its divisors is an integer number (602750010).

Almost surely, 2^1205500019 is an apocalyptic number.

1205500019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205500019 is an equidigital number, since it uses as much as digits as its factorization.

1205500019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 1205500019 is about 34720.3113321295. The cubic root of 1205500019 is about 1064.2796068613.

The spelling of 1205500019 in words is "one billion, two hundred five million, five hundred thousand, nineteen".