649820809139 has 2 divisors, whose sum is σ = 649820809140. Its totient is φ = 649820809138.

The previous prime is 649820809133. The next prime is 649820809151. The reversal of 649820809139 is 931908028946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649820809139 - 2³⁶ = 581101332403 is a prime.

It is not a weakly prime, because it can be changed into another prime (649820809133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324910404569 + 324910404570.

It is an arithmetic number, because the mean of its divisors is an integer number (324910404570).

Almost surely, 2^649820809139 is an apocalyptic number.

649820809139 is a deficient number, since it is larger than the sum of its proper divisors (1).

649820809139 is an equidigital number, since it uses as much as digits as its factorization.

649820809139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6718464, while the sum is 59.

The spelling of 649820809139 in words is "six hundred forty-nine billion, eight hundred twenty million, eight hundred nine thousand, one hundred thirty-nine".