648796139 has 2 divisors, whose sum is σ = 648796140. Its totient is φ = 648796138.

The previous prime is 648796069. The next prime is 648796163. The reversal of 648796139 is 931697846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648796139 - 2¹² = 648792043 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648796039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324398069 + 324398070.

It is an arithmetic number, because the mean of its divisors is an integer number (324398070).

Almost surely, 2^648796139 is an apocalyptic number.

648796139 is a deficient number, since it is larger than the sum of its proper divisors (1).

648796139 is an equidigital number, since it uses as much as digits as its factorization.

648796139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 648796139 is about 25471.4769693475. The cubic root of 648796139 is about 865.7039894711.

The spelling of 648796139 in words is "six hundred forty-eight million, seven hundred ninety-six thousand, one hundred thirty-nine".