123121541 has 4 divisors (see below), whose sum is σ = 123148992. Its totient is φ = 123094092.

The previous prime is 123121519. The next prime is 123121543. The reversal of 123121541 is 145121321.

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: 145121321 = 3863 ⋅37567.

It is a cyclic number.

It is not a de Polignac number, because 123121541 - 2⁶ = 123121477 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 (123121543) 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, 5255 + ... + 16548.

It is an arithmetic number, because the mean of its divisors is an integer number (30787248).

Almost surely, 2^123121541 is an apocalyptic number.

It is an amenable number.

123121541 is a deficient number, since it is larger than the sum of its proper divisors (27451).

123121541 is an equidigital number, since it uses as much as digits as its factorization.

123121541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27450.

The product of its digits is 240, while the sum is 20.

The square root of 123121541 is about 11096.0146449074. The cubic root of 123121541 is about 497.4827360322.

Adding to 123121541 its reverse (145121321), we get a palindrome (268242862).

The spelling of 123121541 in words is "one hundred twenty-three million, one hundred twenty-one thousand, five hundred forty-one".