123551216 has 40 divisors (see below), whose sum is σ = 253567104. Its totient is φ = 58196160.

The previous prime is 123551201. The next prime is 123551221. The reversal of 123551216 is 612155321.

It is a super-3 number, since 3×123551216³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22151 + ... + 27161.

Almost surely, 2^123551216 is an apocalyptic number.

123551216 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 123551216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126783552).

123551216 is an abundant number, since it is smaller than the sum of its proper divisors (130015888).

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

123551216 is a wasteful number, since it uses less digits than its factorization.

123551216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5109 (or 5103 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 123551216 is about 11115.3594633732. The cubic root of 123551216 is about 498.0607765483.

The spelling of 123551216 in words is "one hundred twenty-three million, five hundred fifty-one thousand, two hundred sixteen".