651878961 has 8 divisors (see below), whose sum is σ = 914917920. Its totient is φ = 411712992.

The previous prime is 651878939. The next prime is 651878963. The reversal of 651878961 is 169878156.

651878961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 651878961 - 2¹⁵ = 651846193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (651878963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5718180 + ... + 5718293.

It is an arithmetic number, because the mean of its divisors is an integer number (114364740).

Almost surely, 2^651878961 is an apocalyptic number.

It is an amenable number.

651878961 is a deficient number, since it is larger than the sum of its proper divisors (263038959).

651878961 is a wasteful number, since it uses less digits than its factorization.

651878961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11436495.

The product of its digits is 725760, while the sum is 51.

The square root of 651878961 is about 25531.9204330579. The cubic root of 651878961 is about 867.0729841485.

The spelling of 651878961 in words is "six hundred fifty-one million, eight hundred seventy-eight thousand, nine hundred sixty-one".