648683581 has 8 divisors (see below), whose sum is σ = 798379904. Its totient is φ = 513244080.

The previous prime is 648683561. The next prime is 648683627. The reversal of 648683581 is 185386846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 648683581 - 2⁹ = 648683069 is a prime.

It is a super-2 number, since 2×648683581² = 841580776517967122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648683551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3564105 + ... + 3564286.

It is an arithmetic number, because the mean of its divisors is an integer number (99797488).

Almost surely, 2^648683581 is an apocalyptic number.

It is an amenable number.

648683581 is a deficient number, since it is larger than the sum of its proper divisors (149696323).

648683581 is a wasteful number, since it uses less digits than its factorization.

648683581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7128411.

The product of its digits is 1105920, while the sum is 49.

The square root of 648683581 is about 25469.2673824749. The cubic root of 648683581 is about 865.6539236444.

The spelling of 648683581 in words is "six hundred forty-eight million, six hundred eighty-three thousand, five hundred eighty-one".