123425521 has 4 divisors (see below), whose sum is σ = 128791872. Its totient is φ = 118059172.

The previous prime is 123425513. The next prime is 123425527. The reversal of 123425521 is 125524321.

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: 125524321 = 13 ⋅9655717.

It is a cyclic number.

It is not a de Polignac number, because 123425521 - 2³ = 123425513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123425527) 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, 2683141 + ... + 2683186.

It is an arithmetic number, because the mean of its divisors is an integer number (32197968).

Almost surely, 2^123425521 is an apocalyptic number.

It is an amenable number.

123425521 is a deficient number, since it is larger than the sum of its proper divisors (5366351).

123425521 is an equidigital number, since it uses as much as digits as its factorization.

123425521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5366350.

The product of its digits is 2400, while the sum is 25.

The square root of 123425521 is about 11109.7039114461. The cubic root of 123425521 is about 497.8918182994.

Adding to 123425521 its reverse (125524321), we get a palindrome (248949842).

The spelling of 123425521 in words is "one hundred twenty-three million, four hundred twenty-five thousand, five hundred twenty-one".