648861519 has 8 divisors (see below), whose sum is σ = 866804992. Its totient is φ = 431746200.

The previous prime is 648861511. The next prime is 648861541. The reversal of 648861519 is 915168846.

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

It is not a de Polignac number, because 648861519 - 2³ = 648861511 is a prime.

It is a super-2 number, since 2×648861519² = 842042541677974722, 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 (648861511) 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, 205207 + ... + 208344.

It is an arithmetic number, because the mean of its divisors is an integer number (108350624).

Almost surely, 2^648861519 is an apocalyptic number.

648861519 is a deficient number, since it is larger than the sum of its proper divisors (217943473).

648861519 is a wasteful number, since it uses less digits than its factorization.

648861519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414077.

The product of its digits is 414720, while the sum is 48.

The square root of 648861519 is about 25472.7603333443. The cubic root of 648861519 is about 865.7330678530.

The spelling of 648861519 in words is "six hundred forty-eight million, eight hundred sixty-one thousand, five hundred nineteen".