649471873 has 2 divisors, whose sum is σ = 649471874. Its totient is φ = 649471872.

The previous prime is 649471853. The next prime is 649471883. The reversal of 649471873 is 378174946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 411602944 + 237868929 = 20288^2 + 15423^2 .

It is a cyclic number.

It is not a de Polignac number, because 649471873 - 2²⁵ = 615917441 is a prime.

It is not a weakly prime, because it can be changed into another prime (649471843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324735936 + 324735937.

It is an arithmetic number, because the mean of its divisors is an integer number (324735937).

Almost surely, 2^649471873 is an apocalyptic number.

It is an amenable number.

649471873 is a deficient number, since it is larger than the sum of its proper divisors (1).

649471873 is an equidigital number, since it uses as much as digits as its factorization.

649471873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 49.

The square root of 649471873 is about 25484.7380406391. The cubic root of 649471873 is about 866.0044344597.

The spelling of 649471873 in words is "six hundred forty-nine million, four hundred seventy-one thousand, eight hundred seventy-three".