649471843 has 2 divisors, whose sum is σ = 649471844. Its totient is φ = 649471842.

The previous prime is 649471829. The next prime is 649471853. The reversal of 649471843 is 348174946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649471843 - 2⁵ = 649471811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 649471793 and 649471802.

It is not a weakly prime, because it can be changed into another prime (649471853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324735921 + 324735922.

It is an arithmetic number, because the mean of its divisors is an integer number (324735922).

Almost surely, 2^649471843 is an apocalyptic number.

649471843 is a deficient number, since it is larger than the sum of its proper divisors (1).

649471843 is an equidigital number, since it uses as much as digits as its factorization.

649471843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 46.

The square root of 649471843 is about 25484.7374520516. The cubic root of 649471843 is about 866.0044211257.

The spelling of 649471843 in words is "six hundred forty-nine million, four hundred seventy-one thousand, eight hundred forty-three".