648925302481 has 3 divisors (see below), whose sum is σ = 648926108041. Its totient is φ = 648924496922.

The previous prime is 648925302479. The next prime is 648925302517. The reversal of 648925302481 is 184203529846.

It is a happy number.

The square root of 648925302481 is 805559.

It is a perfect power (a square), and thus also a powerful number.

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.

It is not a de Polignac number, because 648925302481 - 2¹ = 648925302479 is a prime.

It is a super-2 number, since 2×648925302481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648925302451) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 402780 + ... + 1208338.

Almost surely, 2^648925302481 is an apocalyptic number.

648925302481 is the 805559-th square number.

648925302481 is the 402780-th centered octagonal number.

It is an amenable number.

648925302481 is a deficient number, since it is larger than the sum of its proper divisors (805560).

648925302481 is an frugal number, since it uses more digits than its factorization.

648925302481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611118 (or 805559 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 52.

The spelling of 648925302481 in words is "six hundred forty-eight billion, nine hundred twenty-five million, three hundred two thousand, four hundred eighty-one".