648619397 has 4 divisors (see below), whose sum is σ = 682757280. Its totient is φ = 614481516.

The previous prime is 648619373. The next prime is 648619409. The reversal of 648619397 is 793916846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 648619397 - 2⁶ = 648619333 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 (648619327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17068913 + ... + 17068950.

It is an arithmetic number, because the mean of its divisors is an integer number (170689320).

Almost surely, 2^648619397 is an apocalyptic number.

It is an amenable number.

648619397 is a deficient number, since it is larger than the sum of its proper divisors (34137883).

648619397 is a wasteful number, since it uses less digits than its factorization.

648619397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34137882.

The product of its digits is 1959552, while the sum is 53.

The square root of 648619397 is about 25468.0073229140. The cubic root of 648619397 is about 865.6253719922.

The spelling of 648619397 in words is "six hundred forty-eight million, six hundred nineteen thousand, three hundred ninety-seven".