1285200019 has 2 divisors, whose sum is σ = 1285200020. Its totient is φ = 1285200018.

The previous prime is 1285199999. The next prime is 1285200029. The reversal of 1285200019 is 9100025821.

It is a strong prime.

It is an emirp because it is prime and its reverse (9100025821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1285200019 - 2⁵ = 1285199987 is a prime.

It is a super-2 number, since 2×1285200019² = 3303478177675200722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1285200019.

It is not a weakly prime, because it can be changed into another prime (1285200029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642600009 + 642600010.

It is an arithmetic number, because the mean of its divisors is an integer number (642600010).

Almost surely, 2^1285200019 is an apocalyptic number.

1285200019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285200019 is an equidigital number, since it uses as much as digits as its factorization.

1285200019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1285200019 is about 35849.6864560905. The cubic root of 1285200019 is about 1087.2353749754.

The spelling of 1285200019 in words is "one billion, two hundred eighty-five million, two hundred thousand, nineteen".