123240553 has 4 divisors (see below), whose sum is σ = 124800640. Its totient is φ = 121680468.

The previous prime is 123240539. The next prime is 123240569. The reversal of 123240553 is 355042321.

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: 355042321 = 109 ⋅3257269.

It is a cyclic number.

It is not a de Polignac number, because 123240553 - 2²¹ = 121143401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123240253) 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 3 ways as a sum of consecutive naturals, for example, 779925 + ... + 780082.

It is an arithmetic number, because the mean of its divisors is an integer number (31200160).

Almost surely, 2^123240553 is an apocalyptic number.

It is an amenable number.

123240553 is a deficient number, since it is larger than the sum of its proper divisors (1560087).

123240553 is an equidigital number, since it uses as much as digits as its factorization.

123240553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560086.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 123240553 is about 11101.3761759522. The cubic root of 123240553 is about 497.6429770114.

Adding to 123240553 its reverse (355042321), we get a palindrome (478282874).

The spelling of 123240553 in words is "one hundred twenty-three million, two hundred forty thousand, five hundred fifty-three".