648241901 has 4 divisors (see below), whose sum is σ = 670595100. Its totient is φ = 625888704.

The previous prime is 648241883. The next prime is 648241921. The reversal of 648241901 is 109142846.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 505080676 + 143161225 = 22474^2 + 11965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648241901 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 (648241921) 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, 11176556 + ... + 11176613.

It is an arithmetic number, because the mean of its divisors is an integer number (167648775).

Almost surely, 2^648241901 is an apocalyptic number.

It is an amenable number.

648241901 is a deficient number, since it is larger than the sum of its proper divisors (22353199).

648241901 is a wasteful number, since it uses less digits than its factorization.

648241901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22353198.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 648241901 is about 25460.5950637451. The cubic root of 648241901 is about 865.4574082984.

The spelling of 648241901 in words is "six hundred forty-eight million, two hundred forty-one thousand, nine hundred one".