648412991 has 8 divisors (see below), whose sum is σ = 666363264. Its totient is φ = 630564480.

The previous prime is 648412931. The next prime is 648413011. The reversal of 648412991 is 199214846.

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 648412991 - 2¹⁸ = 648150847 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 (648412931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12431 + ... + 38096.

It is an arithmetic number, because the mean of its divisors is an integer number (83295408).

Almost surely, 2^648412991 is an apocalyptic number.

648412991 is a deficient number, since it is larger than the sum of its proper divisors (17950273).

648412991 is a wasteful number, since it uses less digits than its factorization.

648412991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50881.

The product of its digits is 124416, while the sum is 44.

The square root of 648412991 is about 25463.9547399849. The cubic root of 648412991 is about 865.5335414430.

The spelling of 648412991 in words is "six hundred forty-eight million, four hundred twelve thousand, nine hundred ninety-one".