409090909090909 has 2 divisors, whose sum is σ = 409090909090910. Its totient is φ = 409090909090908.

The previous prime is 409090909090901. The next prime is 409090909091003. The reversal of 409090909090909 is 909090909090904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409052445252025 + 38463838884 = 20225045^2 + 196122^2 .

It is a cyclic number.

It is not a de Polignac number, because 409090909090909 - 2³ = 409090909090901 is a prime.

409090909090909 is a modest number, since divided by 9090909 gives 4090909 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409090909090901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204545454545454 + 204545454545455.

It is an arithmetic number, because the mean of its divisors is an integer number (204545454545455).

Almost surely, 2^{409090909090909} is an apocalyptic number.

It is an amenable number.

409090909090909 is a deficient number, since it is larger than the sum of its proper divisors (1).

409090909090909 is an equidigital number, since it uses as much as digits as its factorization.

409090909090909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19131876, while the sum is 67.

The spelling of 409090909090909 in words is "four hundred nine trillion, ninety billion, nine hundred nine million, ninety thousand, nine hundred nine".