651344229481 has 9 divisors (see below), whose sum is σ = 715950109623. Its totient is φ = 592123047120.

The previous prime is 651344229469. The next prime is 651344229511. The reversal of 651344229481 is 184922443156.

The square root of 651344229481 is 807059.

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

It can be written as a sum of positive squares in only one way, i.e., 869719081 + 650474510400 = 29491^2 + 806520^2 .

It is not a de Polignac number, because 651344229481 - 2²³ = 651335840873 is a prime.

It is a super-2 number, since 2×651344229481² (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 (651344229401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8840965 + ... + 8914333.

Almost surely, 2^651344229481 is an apocalyptic number.

651344229481 is the 807059-th square number.

651344229481 is the 403530-th centered octagonal number.

It is an amenable number.

651344229481 is a deficient number, since it is larger than the sum of its proper divisors (64605880142).

651344229481 is an frugal number, since it uses more digits than its factorization.

651344229481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146760 (or 73380 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

Multiplying 651344229481 by its sum of digits (49), we get a square (31915867244569 = 5649413²).

The spelling of 651344229481 in words is "six hundred fifty-one billion, three hundred forty-four million, two hundred twenty-nine thousand, four hundred eighty-one".