123506621 has 16 divisors (see below), whose sum is σ = 149424000. Its totient is φ = 99828288.

The previous prime is 123506597. The next prime is 123506623. The reversal of 123506621 is 126605321.

It is not a de Polignac number, because 123506621 - 2⁶ = 123506557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123506623) 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, 1655 + ... + 15803.

It is an arithmetic number, because the mean of its divisors is an integer number (9339000).

Almost surely, 2^123506621 is an apocalyptic number.

It is an amenable number.

123506621 is a deficient number, since it is larger than the sum of its proper divisors (25917379).

123506621 is a wasteful number, since it uses less digits than its factorization.

123506621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14228.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 123506621 is about 11113.3532743272. The cubic root of 123506621 is about 498.0008454150. Note that the first 3 decimals are identical.

The spelling of 123506621 in words is "one hundred twenty-three million, five hundred six thousand, six hundred twenty-one".