648510631 has 4 divisors (see below), whose sum is σ = 650802472. Its totient is φ = 646218792.

The previous prime is 648510617. The next prime is 648510661. The reversal of 648510631 is 136015846.

It is a happy number.

648510631 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136015846 = 2 ⋅68007923.

It is a cyclic number.

It is not a de Polignac number, because 648510631 - 2¹⁹ = 647986343 is a prime.

It is a super-2 number, since 2×648510631² = 841132077040036322, 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 (648510601) 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, 1145496 + ... + 1146061.

It is an arithmetic number, because the mean of its divisors is an integer number (162700618).

Almost surely, 2^648510631 is an apocalyptic number.

648510631 is a deficient number, since it is larger than the sum of its proper divisors (2291841).

648510631 is a wasteful number, since it uses less digits than its factorization.

648510631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291840.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 648510631 is about 25465.8718876853. The cubic root of 648510631 is about 865.5769841534.

The spelling of 648510631 in words is "six hundred forty-eight million, five hundred ten thousand, six hundred thirty-one".