651291647 has 2 divisors, whose sum is σ = 651291648. Its totient is φ = 651291646.

The previous prime is 651291637. The next prime is 651291673. The reversal of 651291647 is 746192156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 651291647 - 2⁶ = 651291583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651291637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325645823 + 325645824.

It is an arithmetic number, because the mean of its divisors is an integer number (325645824).

Almost surely, 2^651291647 is an apocalyptic number.

651291647 is a deficient number, since it is larger than the sum of its proper divisors (1).

651291647 is an equidigital number, since it uses as much as digits as its factorization.

651291647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 651291647 is about 25520.4162779528. The cubic root of 651291647 is about 866.8125078203.

The spelling of 651291647 in words is "six hundred fifty-one million, two hundred ninety-one thousand, six hundred forty-seven".