123347521 has 24 divisors (see below), whose sum is σ = 140541632. Its totient is φ = 108108000.

The previous prime is 123347513. The next prime is 123347537. The reversal of 123347521 is 125743321.

It is not a de Polignac number, because 123347521 - 2³ = 123347513 is a prime.

It is a super-2 number, since 2×123347521² = 30429221873690882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123347521.

It is not an unprimeable number, because it can be changed into a prime (123347501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 785575 + ... + 785731.

Almost surely, 2^123347521 is an apocalyptic number.

123347521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123347521 is a deficient number, since it is larger than the sum of its proper divisors (17194111).

123347521 is a wasteful number, since it uses less digits than its factorization.

123347521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 362 counting only the distinct ones).

The product of its digits is 5040, while the sum is 28.

The square root of 123347521 is about 11106.1929120649. The cubic root of 123347521 is about 497.7869136162.

The spelling of 123347521 in words is "one hundred twenty-three million, three hundred forty-seven thousand, five hundred twenty-one".