648002123 has 4 divisors (see below), whose sum is σ = 648292248. Its totient is φ = 647712000.

The previous prime is 648002101. The next prime is 648002137. The reversal of 648002123 is 321200846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321200846 = 2 ⋅160600423.

It is a cyclic number.

It is not a de Polignac number, because 648002123 - 2⁸ = 648001867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648002092 and 648002101.

It is not an unprimeable number, because it can be changed into a prime (648002143) 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, 141686 + ... + 146187.

It is an arithmetic number, because the mean of its divisors is an integer number (162073062).

Almost surely, 2^648002123 is an apocalyptic number.

648002123 is a deficient number, since it is larger than the sum of its proper divisors (290125).

648002123 is a wasteful number, since it uses less digits than its factorization.

648002123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290124.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 648002123 is about 25455.8858223398. The cubic root of 648002123 is about 865.3506872130.

Adding to 648002123 its reverse (321200846), we get a palindrome (969202969).

The spelling of 648002123 in words is "six hundred forty-eight million, two thousand, one hundred twenty-three".