648510791 has 4 divisors (see below), whose sum is σ = 650623512. Its totient is φ = 646398072.

The previous prime is 648510769. The next prime is 648510827. The reversal of 648510791 is 197015846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 648510791 - 2⁶ = 648510727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648510721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055900 + ... + 1056513.

It is an arithmetic number, because the mean of its divisors is an integer number (162655878).

Almost surely, 2^648510791 is an apocalyptic number.

648510791 is a deficient number, since it is larger than the sum of its proper divisors (2112721).

648510791 is a wasteful number, since it uses less digits than its factorization.

648510791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112720.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 648510791 is about 25465.8750291444. The cubic root of 648510791 is about 865.5770553382.

The spelling of 648510791 in words is "six hundred forty-eight million, five hundred ten thousand, seven hundred ninety-one".