1081241809 has 2 divisors, whose sum is σ = 1081241810. Its totient is φ = 1081241808.

The previous prime is 1081241761. The next prime is 1081241849. The reversal of 1081241809 is 9081421801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 640241809 + 441000000 = 25303^2 + 21000^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081241809 - 2²¹ = 1079144657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1081241849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540620904 + 540620905.

It is an arithmetic number, because the mean of its divisors is an integer number (540620905).

Almost surely, 2^1081241809 is an apocalyptic number.

It is an amenable number.

1081241809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081241809 is an equidigital number, since it uses as much as digits as its factorization.

1081241809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 1081241809 is about 32882.2415446393. The cubic root of 1081241809 is about 1026.3786513710.

The spelling of 1081241809 in words is "one billion, eighty-one million, two hundred forty-one thousand, eight hundred nine".