651212641 has 4 divisors (see below), whose sum is σ = 651692484. Its totient is φ = 650732800.

The previous prime is 651212609. The next prime is 651212647. The reversal of 651212641 is 146212156.

651212641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 215238241 + 435974400 = 14671^2 + 20880^2 .

It is a cyclic number.

It is not a de Polignac number, because 651212641 - 2⁵ = 651212609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651212647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237880 + ... + 240601.

It is an arithmetic number, because the mean of its divisors is an integer number (162923121).

Almost surely, 2^651212641 is an apocalyptic number.

It is an amenable number.

651212641 is a deficient number, since it is larger than the sum of its proper divisors (479843).

651212641 is a wasteful number, since it uses less digits than its factorization.

651212641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479842.

The product of its digits is 2880, while the sum is 28.

The square root of 651212641 is about 25518.8683330590. The cubic root of 651212641 is about 866.7774563659. Note that the first 3 decimals are identical.

Adding to 651212641 its reverse (146212156), we get a palindrome (797424797).

The spelling of 651212641 in words is "six hundred fifty-one million, two hundred twelve thousand, six hundred forty-one".