649342723 has 2 divisors, whose sum is σ = 649342724. Its totient is φ = 649342722.

The previous prime is 649342717. The next prime is 649342747. The reversal of 649342723 is 327243946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649342723 - 2⁵ = 649342691 is a prime.

It is not a weakly prime, because it can be changed into another prime (649342703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324671361 + 324671362.

It is an arithmetic number, because the mean of its divisors is an integer number (324671362).

Almost surely, 2^649342723 is an apocalyptic number.

649342723 is a deficient number, since it is larger than the sum of its proper divisors (1).

649342723 is an equidigital number, since it uses as much as digits as its factorization.

649342723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 40.

The square root of 649342723 is about 25482.2040451763. The cubic root of 649342723 is about 865.9470278745.

The spelling of 649342723 in words is "six hundred forty-nine million, three hundred forty-two thousand, seven hundred twenty-three".