1219557005 has 4 divisors (see below), whose sum is σ = 1463468412. Its totient is φ = 975645600.

The previous prime is 1219556993. The next prime is 1219557029. The reversal of 1219557005 is 5007559121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5007559121 = 63793 ⋅78497.

It can be written as a sum of positive squares in 2 ways, for example, as 814017961 + 405539044 = 28531^2 + 20138^2 .

It is not a de Polignac number, because 1219557005 - 2⁶ = 1219556941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121955696 + ... + 121955705.

It is an arithmetic number, because the mean of its divisors is an integer number (365867103).

Almost surely, 2^1219557005 is an apocalyptic number.

It is an amenable number.

1219557005 is a deficient number, since it is larger than the sum of its proper divisors (243911407).

1219557005 is an equidigital number, since it uses as much as digits as its factorization.

1219557005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243911406.

The product of its (nonzero) digits is 15750, while the sum is 35.

The square root of 1219557005 is about 34922.1563624012. The cubic root of 1219557005 is about 1068.4003829815.

The spelling of 1219557005 in words is "one billion, two hundred nineteen million, five hundred fifty-seven thousand, five".