648783481 has 4 divisors (see below), whose sum is σ = 682930000. Its totient is φ = 614636964.

The previous prime is 648783451. The next prime is 648783491. The reversal of 648783481 is 184387846.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 648783481 - 2⁷ = 648783353 is a prime.

It is a super-2 number, since 2×648783481² = 841840010436954722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648783451) 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, 17073231 + ... + 17073268.

It is an arithmetic number, because the mean of its divisors is an integer number (170732500).

Almost surely, 2^648783481 is an apocalyptic number.

It is an amenable number.

648783481 is a deficient number, since it is larger than the sum of its proper divisors (34146519).

648783481 is a wasteful number, since it uses less digits than its factorization.

648783481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34146518.

The product of its digits is 1032192, while the sum is 49.

The square root of 648783481 is about 25471.2284941265. The cubic root of 648783481 is about 865.6983594785.

The spelling of 648783481 in words is "six hundred forty-eight million, seven hundred eighty-three thousand, four hundred eighty-one".