1219381056 has 42 divisors (see below), whose sum is σ = 3495137282. Its totient is φ = 406460160.

The previous prime is 1219381043. The next prime is 1219381103. The reversal of 1219381056 is 6501839121.

It can be written as a sum of positive squares in only one way, i.e., 1145145600 + 74235456 = 33840^2 + 8616^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1219381056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1057915 + ... + 1059066.

Almost surely, 2^1219381056 is an apocalyptic number.

1219381056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1219381056 is an abundant number, since it is smaller than the sum of its proper divisors (2275756226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1219381056 is a wasteful number, since it uses less digits than its factorization.

1219381056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116999 (or 2116986 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1219381056 is about 34919.6371115165. The cubic root of 1219381056 is about 1068.3490001107.

The spelling of 1219381056 in words is "one billion, two hundred nineteen million, three hundred eighty-one thousand, fifty-six".