984640651 has 4 divisors (see below), whose sum is σ = 984704704. Its totient is φ = 984576600.

The previous prime is 984640637. The next prime is 984640661. The reversal of 984640651 is 156046489.

984640651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(984640651) divides (984640651-1)³.

It is a cyclic number.

It is not a de Polignac number, because 984640651 - 2⁷ = 984640523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 984640598 and 984640607.

It is not an unprimeable number, because it can be changed into a prime (984640661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6406 + ... + 44836.

It is an arithmetic number, because the mean of its divisors is an integer number (246176176).

Almost surely, 2^984640651 is an apocalyptic number.

984640651 is the 25621-st pentagonal number.

984640651 is a deficient number, since it is larger than the sum of its proper divisors (64053).

984640651 is a wasteful number, since it uses less digits than its factorization.

984640651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64052.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 984640651 is about 31378.9842251147. The cubic root of 984640651 is about 994.8537788379.

The spelling of 984640651 in words is "nine hundred eighty-four million, six hundred forty thousand, six hundred fifty-one".