648173291 has 2 divisors, whose sum is σ = 648173292. Its totient is φ = 648173290.

The previous prime is 648173261. The next prime is 648173347. The reversal of 648173291 is 192371846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648173291 - 2¹⁰ = 648172267 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648173261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324086645 + 324086646.

It is an arithmetic number, because the mean of its divisors is an integer number (324086646).

Almost surely, 2^648173291 is an apocalyptic number.

648173291 is a deficient number, since it is larger than the sum of its proper divisors (1).

648173291 is an equidigital number, since it uses as much as digits as its factorization.

648173291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 648173291 is about 25459.2476518848. The cubic root of 648173291 is about 865.4268738494.

The spelling of 648173291 in words is "six hundred forty-eight million, one hundred seventy-three thousand, two hundred ninety-one".