1026864781 has 2 divisors, whose sum is σ = 1026864782. Its totient is φ = 1026864780.

The previous prime is 1026864749. The next prime is 1026864841. The reversal of 1026864781 is 1874686201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 882624681 + 144240100 = 29709^2 + 12010^2 .

It is a cyclic number.

It is not a de Polignac number, because 1026864781 - 2⁵ = 1026864749 is a prime.

It is a super-2 number, since 2×1026864781² = 2108902556916355922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1026864701) 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, 513432390 + 513432391.

It is an arithmetic number, because the mean of its divisors is an integer number (513432391).

Almost surely, 2^1026864781 is an apocalyptic number.

It is an amenable number.

1026864781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1026864781 is an equidigital number, since it uses as much as digits as its factorization.

1026864781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 1026864781 is about 32044.7309397349. The cubic root of 1026864781 is about 1008.8759120976.

The spelling of 1026864781 in words is "one billion, twenty-six million, eight hundred sixty-four thousand, seven hundred eighty-one".