648345591 has 6 divisors (see below), whose sum is σ = 936499200. Its totient is φ = 432230388.

The previous prime is 648345583. The next prime is 648345601. The reversal of 648345591 is 195543846.

648345591 is a `hidden beast` number, since 64 + 8 + 34 + 559 + 1 = 666.

It is not a de Polignac number, because 648345591 - 2³ = 648345583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648345521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36019191 + ... + 36019208.

It is an arithmetic number, because the mean of its divisors is an integer number (156083200).

Almost surely, 2^648345591 is an apocalyptic number.

648345591 is a deficient number, since it is larger than the sum of its proper divisors (288153609).

648345591 is a wasteful number, since it uses less digits than its factorization.

648345591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72038405 (or 72038402 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 648345591 is about 25462.6312662301. The cubic root of 648345591 is about 865.5035507926.

It can be divided in two parts, 64 and 8345591, that added together give a triangular number (8345655 = T₄₀₈₅).

The spelling of 648345591 in words is "six hundred forty-eight million, three hundred forty-five thousand, five hundred ninety-one".