651312321 has 32 divisors (see below), whose sum is σ = 992037888. Its totient is φ = 376242240.

The previous prime is 651312301. The next prime is 651312329. The reversal of 651312321 is 123213156.

It is not a de Polignac number, because 651312321 - 2⁹ = 651311809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 651312291 and 651312300.

It is not an unprimeable number, because it can be changed into a prime (651312329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239250 + ... + 241956.

It is an arithmetic number, because the mean of its divisors is an integer number (31001184).

Almost surely, 2^651312321 is an apocalyptic number.

It is an amenable number.

651312321 is a deficient number, since it is larger than the sum of its proper divisors (340725567).

651312321 is a wasteful number, since it uses less digits than its factorization.

651312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3061.

The product of its digits is 1080, while the sum is 24.

The square root of 651312321 is about 25520.8213229904. The cubic root of 651312321 is about 866.8216794883.

Adding to 651312321 its reverse (123213156), we get a palindrome (774525477).

The spelling of 651312321 in words is "six hundred fifty-one million, three hundred twelve thousand, three hundred twenty-one".