648134815 has 4 divisors (see below), whose sum is σ = 777761784. Its totient is φ = 518507848.

The previous prime is 648134801. The next prime is 648134863. The reversal of 648134815 is 518431846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 518431846 = 2 ⋅259215923.

It is a cyclic number.

It is not a de Polignac number, because 648134815 - 2¹¹ = 648132767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64813477 + ... + 64813486.

It is an arithmetic number, because the mean of its divisors is an integer number (194440446).

Almost surely, 2^648134815 is an apocalyptic number.

648134815 is a deficient number, since it is larger than the sum of its proper divisors (129626969).

648134815 is a wasteful number, since it uses less digits than its factorization.

648134815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129626968.

The product of its digits is 92160, while the sum is 40.

The square root of 648134815 is about 25458.4920016878. The cubic root of 648134815 is about 865.4097494046.

The spelling of 648134815 in words is "six hundred forty-eight million, one hundred thirty-four thousand, eight hundred fifteen".