651972321 has 240 divisors, whose sum is σ = 1427513472. Its totient is φ = 287400960.

The previous prime is 651972319. The next prime is 651972353. The reversal of 651972321 is 123279156.

It is not a de Polignac number, because 651972321 - 2¹ = 651972319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (651972521) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 15162126 + ... + 15162168.

Almost surely, 2^651972321 is an apocalyptic number.

It is an amenable number.

651972321 is an abundant number, since it is smaller than the sum of its proper divisors (775541151).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651972321 is a wasteful number, since it uses less digits than its factorization.

651972321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 94 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 651972321 is about 25533.7486672051. The cubic root of 651972321 is about 867.1143753037.

The spelling of 651972321 in words is "six hundred fifty-one million, nine hundred seventy-two thousand, three hundred twenty-one".