1020688651 has 2 divisors, whose sum is σ = 1020688652. Its totient is φ = 1020688650.

The previous prime is 1020688649. The next prime is 1020688673. The reversal of 1020688651 is 1568860201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020688651 - 2¹ = 1020688649 is a prime.

Together with 1020688649, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1020688651.

It is not a weakly prime, because it can be changed into another prime (1020688601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510344325 + 510344326.

It is an arithmetic number, because the mean of its divisors is an integer number (510344326).

Almost surely, 2^1020688651 is an apocalyptic number.

1020688651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020688651 is an equidigital number, since it uses as much as digits as its factorization.

1020688651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 1020688651 is about 31948.2182758288. The cubic root of 1020688651 is about 1006.8491983795.

The spelling of 1020688651 in words is "one billion, twenty million, six hundred eighty-eight thousand, six hundred fifty-one".