648510013 has 4 divisors (see below), whose sum is σ = 651802140. Its totient is φ = 645217888.

The previous prime is 648510011. The next prime is 648510017. The reversal of 648510013 is 310015846.

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

It can be written as a sum of positive squares in 2 ways, for example, as 343064484 + 305445529 = 18522^2 + 17477^2 .

It is a cyclic number.

It is not a de Polignac number, because 648510013 - 2¹ = 648510011 is a prime.

It is a super-2 number, since 2×648510013² = 841130473922520338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648510011) 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, 1645768 + ... + 1646161.

It is an arithmetic number, because the mean of its divisors is an integer number (162950535).

Almost surely, 2^648510013 is an apocalyptic number.

It is an amenable number.

648510013 is a deficient number, since it is larger than the sum of its proper divisors (3292127).

648510013 is a wasteful number, since it uses less digits than its factorization.

648510013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3292126.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 648510013 is about 25465.8597537959. The cubic root of 648510013 is about 865.5767092020.

Adding to 648510013 its reverse (310015846), we get a palindrome (958525859).

The spelling of 648510013 in words is "six hundred forty-eight million, five hundred ten thousand, thirteen".