1009366781 has 2 divisors, whose sum is σ = 1009366782. Its totient is φ = 1009366780.

The previous prime is 1009366763. The next prime is 1009366793. The reversal of 1009366781 is 1876639001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 767844100 + 241522681 = 27710^2 + 15541^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009366781 - 2⁶ = 1009366717 is a prime.

It is a super-2 number, since 2×1009366781² = 2037642597172603922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009366181) 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, 504683390 + 504683391.

It is an arithmetic number, because the mean of its divisors is an integer number (504683391).

Almost surely, 2^1009366781 is an apocalyptic number.

It is an amenable number.

1009366781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009366781 is an equidigital number, since it uses as much as digits as its factorization.

1009366781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 1009366781 is about 31770.5332186918. The cubic root of 1009366781 is about 1003.1125622381.

The spelling of 1009366781 in words is "one billion, nine million, three hundred sixty-six thousand, seven hundred eighty-one".