649123 has 2 divisors, whose sum is σ = 649124. Its totient is φ = 649122.

The previous prime is 649093. The next prime is 649141. The reversal of 649123 is 321946.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649123 is a prime.

It is a d-powerful number, because it can be written as 6 + 4⁸ + 1 + 9⁵ + 2¹⁹ + 3⁵ .

It is not a weakly prime, because it can be changed into another prime (649183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324561 + 324562.

It is an arithmetic number, because the mean of its divisors is an integer number (324562).

2⁶⁴⁹¹²³ is an apocalyptic number.

649123 is a deficient number, since it is larger than the sum of its proper divisors (1).

649123 is an equidigital number, since it uses as much as digits as its factorization.

649123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 649123 is about 805.6816989358. The cubic root of 649123 is about 86.5849344511.

The spelling of 649123 in words is "six hundred forty-nine thousand, one hundred twenty-three".