1213044656 has 80 divisors (see below), whose sum is σ = 2634259968. Its totient is φ = 538137600.

The previous prime is 1213044641. The next prime is 1213044659. The reversal of 1213044656 is 6564403121.

It is not an unprimeable number, because it can be changed into a prime (1213044659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 442811 + ... + 445541.

Almost surely, 2^1213044656 is an apocalyptic number.

1213044656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213044656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317129984).

1213044656 is an abundant number, since it is smaller than the sum of its proper divisors (1421215312).

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

1213044656 is a wasteful number, since it uses less digits than its factorization.

1213044656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850 (or 2844 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1213044656 is about 34828.7906192564. The cubic root of 1213044656 is about 1066.4952601311.

Adding to 1213044656 its reverse (6564403121), we get a palindrome (7777447777).

The spelling of 1213044656 in words is "one billion, two hundred thirteen million, forty-four thousand, six hundred fifty-six".