651064639 has 2 divisors, whose sum is σ = 651064640. Its totient is φ = 651064638.

The previous prime is 651064607. The next prime is 651064669. The reversal of 651064639 is 936460156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 651064639 - 2⁵ = 651064607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651064669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325532319 + 325532320.

It is an arithmetic number, because the mean of its divisors is an integer number (325532320).

Almost surely, 2^651064639 is an apocalyptic number.

651064639 is a deficient number, since it is larger than the sum of its proper divisors (1).

651064639 is an equidigital number, since it uses as much as digits as its factorization.

651064639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 651064639 is about 25515.9683139794. The cubic root of 651064639 is about 866.7117868192.

The spelling of 651064639 in words is "six hundred fifty-one million, sixty-four thousand, six hundred thirty-nine".