648142291 has 4 divisors (see below), whose sum is σ = 648216072. Its totient is φ = 648068512.

The previous prime is 648142273. The next prime is 648142367. The reversal of 648142291 is 192241846.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 192241846 = 2 ⋅96120923.

It is a cyclic number.

It is not a de Polignac number, because 648142291 - 2⁵ = 648142259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 648142291.

It is not an unprimeable number, because it can be changed into a prime (648142591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21601 + ... + 41986.

It is an arithmetic number, because the mean of its divisors is an integer number (162054018).

Almost surely, 2^648142291 is an apocalyptic number.

648142291 is a deficient number, since it is larger than the sum of its proper divisors (73781).

648142291 is a wasteful number, since it uses less digits than its factorization.

648142291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73780.

The product of its digits is 27648, while the sum is 37.

The square root of 648142291 is about 25458.6388284998. The cubic root of 648142291 is about 865.4130767877.

The spelling of 648142291 in words is "six hundred forty-eight million, one hundred forty-two thousand, two hundred ninety-one".