651321441 has 27 divisors (see below), whose sum is σ = 966580563. Its totient is φ = 422627760.

The previous prime is 651321413. The next prime is 651321497. The reversal of 651321441 is 144123156.

It is a happy number.

The square root of 651321441 is 25521.

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

651321441 is a `hidden beast` number, since 6 + 513 + 2 + 144 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7177041 + 644144400 = 2679^2 + 25380^2 .

It is not a de Polignac number, because 651321441 - 2⁵ = 651321409 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (651331441) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3598371 + ... + 3598551.

Almost surely, 2^651321441 is an apocalyptic number.

651321441 is the 25521-st square number.

651321441 is the 12761-st centered octagonal number.

It is an amenable number.

651321441 is a deficient number, since it is larger than the sum of its proper divisors (315259122).

651321441 is an equidigital number, since it uses as much as digits as its factorization.

651321441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 231 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The cubic root of 651321441 is about 866.8257253592.

Adding to 651321441 its reverse (144123156), we get a palindrome (795444597).

The spelling of 651321441 in words is "six hundred fifty-one million, three hundred twenty-one thousand, four hundred forty-one".