651491972 has 12 divisors (see below), whose sum is σ = 1143755676. Its totient is φ = 324704640.

The previous prime is 651491959. The next prime is 651492029. The reversal of 651491972 is 279194156.

651491972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 79995136 + 571496836 = 8944^2 + 23906^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258929 + ... + 261432.

It is an arithmetic number, because the mean of its divisors is an integer number (95312973).

Almost surely, 2^651491972 is an apocalyptic number.

It is an amenable number.

651491972 is a deficient number, since it is larger than the sum of its proper divisors (492263704).

651491972 is a wasteful number, since it uses less digits than its factorization.

651491972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520678 (or 520676 counting only the distinct ones).

The product of its digits is 136080, while the sum is 44.

The square root of 651491972 is about 25524.3407750328. The cubic root of 651491972 is about 866.9013704245.

The spelling of 651491972 in words is "six hundred fifty-one million, four hundred ninety-one thousand, nine hundred seventy-two".