123311056 has 80 divisors (see below), whose sum is σ = 272982528. Its totient is φ = 53452800.

The previous prime is 123311053. The next prime is 123311099. The reversal of 123311056 is 650113321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123311051) 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, 529116 + ... + 529348.

Almost surely, 2^123311056 is an apocalyptic number.

123311056 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 123311056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136491264).

123311056 is an abundant number, since it is smaller than the sum of its proper divisors (149671472).

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

123311056 is a wasteful number, since it uses less digits than its factorization.

123311056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 123311056 is about 11104.5511390601. The cubic root of 123311056 is about 497.7378555060.

Adding to 123311056 its reverse (650113321), we get a palindrome (773424377).

The spelling of 123311056 in words is "one hundred twenty-three million, three hundred eleven thousand, fifty-six".