1205490019 has 2 divisors, whose sum is σ = 1205490020. Its totient is φ = 1205490018.

The previous prime is 1205489977. The next prime is 1205490023. The reversal of 1205490019 is 9100945021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1205490019 - 2⁷ = 1205489891 is a prime.

It is a super-2 number, since 2×1205490019² = 2906412371817240722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1205490029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602745009 + 602745010.

It is an arithmetic number, because the mean of its divisors is an integer number (602745010).

Almost surely, 2^1205490019 is an apocalyptic number.

1205490019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205490019 is an equidigital number, since it uses as much as digits as its factorization.

1205490019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 1205490019 is about 34720.1673239056. The cubic root of 1205490019 is about 1064.2766640090.

The spelling of 1205490019 in words is "one billion, two hundred five million, four hundred ninety thousand, nineteen".