648626191 has 8 divisors (see below), whose sum is σ = 670546800. Its totient is φ = 626996160.

The previous prime is 648626183. The next prime is 648626201. The reversal of 648626191 is 191626846.

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

It is a cyclic number.

It is not a de Polignac number, because 648626191 - 2³ = 648626183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648626291) 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, 68101 + ... + 77038.

It is an arithmetic number, because the mean of its divisors is an integer number (83818350).

Almost surely, 2^648626191 is an apocalyptic number.

648626191 is a deficient number, since it is larger than the sum of its proper divisors (21920609).

648626191 is a wasteful number, since it uses less digits than its factorization.

648626191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145289.

The product of its digits is 124416, while the sum is 43.

The square root of 648626191 is about 25468.1407055953. The cubic root of 648626191 is about 865.6283943287.

The spelling of 648626191 in words is "six hundred forty-eight million, six hundred twenty-six thousand, one hundred ninety-one".