123734521 has 4 divisors (see below), whose sum is σ = 126612112. Its totient is φ = 120856932.

The previous prime is 123734519. The next prime is 123734531. The reversal of 123734521 is 125437321.

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: 125437321 = 43 ⋅2917147.

It is a cyclic number.

It is not a de Polignac number, because 123734521 - 2¹ = 123734519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123734521.

It is not an unprimeable number, because it can be changed into a prime (123734531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1438731 + ... + 1438816.

It is an arithmetic number, because the mean of its divisors is an integer number (31653028).

Almost surely, 2^123734521 is an apocalyptic number.

It is an amenable number.

123734521 is a deficient number, since it is larger than the sum of its proper divisors (2877591).

123734521 is an equidigital number, since it uses as much as digits as its factorization.

123734521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877590.

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

The square root of 123734521 is about 11123.6019795748. The cubic root of 123734521 is about 498.3069684253.

The spelling of 123734521 in words is "one hundred twenty-three million, seven hundred thirty-four thousand, five hundred twenty-one".