1219531198 has 4 divisors (see below), whose sum is σ = 1829296800. Its totient is φ = 609765598.

The previous prime is 1219531189. The next prime is 1219531217. The reversal of 1219531198 is 8911359121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8911359121 = 7 ⋅1273051303.

It is a self number, because there is not a number n which added to its sum of digits gives 1219531198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304882798 + ... + 304882801.

It is an arithmetic number, because the mean of its divisors is an integer number (457324200).

Almost surely, 2^1219531198 is an apocalyptic number.

1219531198 is a deficient number, since it is larger than the sum of its proper divisors (609765602).

1219531198 is an equidigital number, since it uses as much as digits as its factorization.

1219531198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609765601.

The product of its digits is 19440, while the sum is 40.

The square root of 1219531198 is about 34921.7868672266. The cubic root of 1219531198 is about 1068.3928468015.

The spelling of 1219531198 in words is "one billion, two hundred nineteen million, five hundred thirty-one thousand, one hundred ninety-eight".