1909085149 has 2 divisors, whose sum is σ = 1909085150. Its totient is φ = 1909085148.

The previous prime is 1909085137. The next prime is 1909085197. The reversal of 1909085149 is 9415809091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1721669049 + 187416100 = 41493^2 + 13690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909085149 - 2¹¹ = 1909083101 is a prime.

It is a super-2 number, since 2×1909085149² = 7289212212264704402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1909085099 and 1909085108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1909085449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954542574 + 954542575.

It is an arithmetic number, because the mean of its divisors is an integer number (954542575).

Almost surely, 2^1909085149 is an apocalyptic number.

It is an amenable number.

1909085149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909085149 is an equidigital number, since it uses as much as digits as its factorization.

1909085149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 46.

The square root of 1909085149 is about 43693.0789599451. The cubic root of 1909085149 is about 1240.5333183261.

The spelling of 1909085149 in words is "one billion, nine hundred nine million, eighty-five thousand, one hundred forty-nine".