1219891056 has 40 divisors (see below), whose sum is σ = 3152667264. Its totient is φ = 406464960.

The previous prime is 1219891051. The next prime is 1219891087. The reversal of 1219891056 is 6501989121.

It is a junction number, because it is equal to n+sod(n) for n = 1219890999 and 1219891017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219891051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190141 + ... + 196451.

Almost surely, 2^1219891056 is an apocalyptic number.

1219891056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1219891056 is an abundant number, since it is smaller than the sum of its proper divisors (1932776208).

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

1219891056 is a wasteful number, since it uses less digits than its factorization.

1219891056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10349 (or 10343 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 42.

The square root of 1219891056 is about 34926.9388295052. The cubic root of 1219891056 is about 1068.4979232177.

The spelling of 1219891056 in words is "one billion, two hundred nineteen million, eight hundred ninety-one thousand, fifty-six".