Search a number
BaseRepresentation
bin11101111011110100010…
…11101111010010101111
310122022212012210102012211
432331322023233102233
5113322431023101031
62104301421311251
7134211232640404
oct16757213572257
93568765712184
101028547081391
11367228016745
1214740a405527
1375cb764448b
151bb4ca45bb1
hexef7a2ef4af

1028547081391 has 2 divisors, whose sum is σ = 1028547081392. Its totient is φ = 1028547081390.

The previous prime is 1028547081329. The next prime is 1028547081403. The reversal of 1028547081391 is 1931807458201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1028547081391 - 29 = 1028547080879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028547061391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514273540695 + 514273540696.

It is an arithmetic number, because the mean of its divisors is an integer number (514273540696).

Almost surely, 21028547081391 is an apocalyptic number.

1028547081391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028547081391 is an equidigital number, since it uses as much as digits as its factorization.

1028547081391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 1028547081391 in words is "one trillion, twenty-eight billion, five hundred forty-seven million, eighty-one thousand, three hundred ninety-one".