1219103945 has 4 divisors (see below), whose sum is σ = 1462924740. Its totient is φ = 975283152.

The previous prime is 1219103939. The next prime is 1219103959. The reversal of 1219103945 is 5493019121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5493019121 = 59 ⋅93102019.

It can be written as a sum of positive squares in 2 ways, for example, as 405257161 + 813846784 = 20131^2 + 28528^2 .

It is a cyclic number.

It is not a de Polignac number, because 1219103945 - 2⁴ = 1219103929 is a prime.

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, 121910390 + ... + 121910399.

It is an arithmetic number, because the mean of its divisors is an integer number (365731185).

Almost surely, 2^1219103945 is an apocalyptic number.

It is an amenable number.

1219103945 is a deficient number, since it is larger than the sum of its proper divisors (243820795).

1219103945 is an equidigital number, since it uses as much as digits as its factorization.

1219103945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243820794.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1219103945 is about 34915.6690470052. The cubic root of 1219103945 is about 1068.2680645991.

The spelling of 1219103945 in words is "one billion, two hundred nineteen million, one hundred three thousand, nine hundred forty-five".