1009419781 has 2 divisors, whose sum is σ = 1009419782. Its totient is φ = 1009419780.

The previous prime is 1009419773. The next prime is 1009419809. The reversal of 1009419781 is 1879149001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 600005025 + 409414756 = 24495^2 + 20234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009419781 - 2³ = 1009419773 is a prime.

It is a super-2 number, since 2×1009419781² = 2037856588548175922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009419701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504709890 + 504709891.

It is an arithmetic number, because the mean of its divisors is an integer number (504709891).

Almost surely, 2^1009419781 is an apocalyptic number.

It is an amenable number.

1009419781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009419781 is an equidigital number, since it uses as much as digits as its factorization.

1009419781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 40.

The square root of 1009419781 is about 31771.3673139826. The cubic root of 1009419781 is about 1003.1301191316.

The spelling of 1009419781 in words is "one billion, nine million, four hundred nineteen thousand, seven hundred eighty-one".