1909559149 has 2 divisors, whose sum is σ = 1909559150. Its totient is φ = 1909559148.

The previous prime is 1909559083. The next prime is 1909559209. The reversal of 1909559149 is 9419559091.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1533897225 + 375661924 = 39165^2 + 19382^2 .

It is an emirp because it is prime and its reverse (9419559091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1909559149 - 2¹³ = 1909550957 is a prime.

It is a super-2 number, since 2×1909559149² = 7292832287059208402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1909559096 and 1909559105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1909559749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954779574 + 954779575.

It is an arithmetic number, because the mean of its divisors is an integer number (954779575).

Almost surely, 2^1909559149 is an apocalyptic number.

It is an amenable number.

1909559149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909559149 is an equidigital number, since it uses as much as digits as its factorization.

1909559149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 656100, while the sum is 52.

The square root of 1909559149 is about 43698.5028233234. The cubic root of 1909559149 is about 1240.6359790402.

The spelling of 1909559149 in words is "one billion, nine hundred nine million, five hundred fifty-nine thousand, one hundred forty-nine".