648948197 has 4 divisors (see below), whose sum is σ = 677163360. Its totient is φ = 620733036.

The previous prime is 648948103. The next prime is 648948227. The reversal of 648948197 is 791849846.

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, and also an emirpimes, since its reverse is a distinct semiprime: 791849846 = 2 ⋅395924923.

It is a cyclic number.

It is not a de Polignac number, because 648948197 - 2²⁰ = 647899621 is a prime.

It is a super-2 number, since 2×648948197² = 842267524779101618, 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 (645948197) 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, 14107547 + ... + 14107592.

It is an arithmetic number, because the mean of its divisors is an integer number (169290840).

Almost surely, 2^648948197 is an apocalyptic number.

It is an amenable number.

648948197 is a deficient number, since it is larger than the sum of its proper divisors (28215163).

648948197 is a wasteful number, since it uses less digits than its factorization.

648948197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28215162.

The product of its digits is 3483648, while the sum is 56.

The square root of 648948197 is about 25474.4616626142. The cubic root of 648948197 is about 865.7716157134.

The spelling of 648948197 in words is "six hundred forty-eight million, nine hundred forty-eight thousand, one hundred ninety-seven".