123521113 has 4 divisors (see below), whose sum is σ = 123556608. Its totient is φ = 123485620.

The previous prime is 123521093. The next prime is 123521117. The reversal of 123521113 is 311125321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 311125321 = 13 ⋅23932717.

It is a cyclic number.

It is not a de Polignac number, because 123521113 - 2⁹ = 123520601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123521117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11881 + ... + 19702.

It is an arithmetic number, because the mean of its divisors is an integer number (30889152).

Almost surely, 2^123521113 is an apocalyptic number.

It is an amenable number.

123521113 is a deficient number, since it is larger than the sum of its proper divisors (35495).

123521113 is an equidigital number, since it uses as much as digits as its factorization.

123521113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35494.

The product of its digits is 180, while the sum is 19.

The square root of 123521113 is about 11114.0052636302. The cubic root of 123521113 is about 498.0203227676.

Adding to 123521113 its reverse (311125321), we get a palindrome (434646434).

The spelling of 123521113 in words is "one hundred twenty-three million, five hundred twenty-one thousand, one hundred thirteen".