649071623 has 2 divisors, whose sum is σ = 649071624. Its totient is φ = 649071622.

The previous prime is 649071601. The next prime is 649071629. The reversal of 649071623 is 326170946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649071623 - 2¹² = 649067527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649071629) 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 as a sum of consecutive naturals, namely, 324535811 + 324535812.

It is an arithmetic number, because the mean of its divisors is an integer number (324535812).

Almost surely, 2^649071623 is an apocalyptic number.

649071623 is a deficient number, since it is larger than the sum of its proper divisors (1).

649071623 is an equidigital number, since it uses as much as digits as its factorization.

649071623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 649071623 is about 25476.8840912699. The cubic root of 649071623 is about 865.8265003991.

The spelling of 649071623 in words is "six hundred forty-nine million, seventy-one thousand, six hundred twenty-three".