1648972201 has 4 divisors (see below), whose sum is σ = 1653393412. Its totient is φ = 1644550992.

The previous prime is 1648972183. The next prime is 1648972207. The reversal of 1648972201 is 1022798461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1022798461 = 1613 ⋅634097.

It can be written as a sum of positive squares in 2 ways, for example, as 1240730176 + 408242025 = 35224^2 + 20205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1648972201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1648972207) 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, 2210046 + ... + 2210791.

It is an arithmetic number, because the mean of its divisors is an integer number (413348353).

Almost surely, 2^1648972201 is an apocalyptic number.

It is an amenable number.

1648972201 is a deficient number, since it is larger than the sum of its proper divisors (4421211).

1648972201 is an equidigital number, since it uses as much as digits as its factorization.

1648972201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4421210.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1648972201 is about 40607.5387212769. The cubic root of 1648972201 is about 1181.4203429642.

The spelling of 1648972201 in words is "one billion, six hundred forty-eight million, nine hundred seventy-two thousand, two hundred one".