648861041 has 4 divisors (see below), whose sum is σ = 648991092. Its totient is φ = 648730992.

The previous prime is 648860999. The next prime is 648861079. The reversal of 648861041 is 140168846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 140168846 = 2 ⋅70084423.

It can be written as a sum of positive squares in 2 ways, for example, as 373301041 + 275560000 = 19321^2 + 16600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648861041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648860986 and 648861004.

It is not an unprimeable number, because it can be changed into a prime (648861541) 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, 57230 + ... + 67623.

It is an arithmetic number, because the mean of its divisors is an integer number (162247773).

Almost surely, 2^648861041 is an apocalyptic number.

It is an amenable number.

648861041 is a deficient number, since it is larger than the sum of its proper divisors (130051).

648861041 is a wasteful number, since it uses less digits than its factorization.

648861041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130050.

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 648861041 is about 25472.7509507709. The cubic root of 648861041 is about 865.7328552650.

The spelling of 648861041 in words is "six hundred forty-eight million, eight hundred sixty-one thousand, forty-one".