1909241 has 2 divisors, whose sum is σ = 1909242. Its totient is φ = 1909240.

The previous prime is 1909231. The next prime is 1909267. The reversal of 1909241 is 1429091.

It is an a-pointer prime, because the next prime (1909267) can be obtained adding 1909241 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1092025 + 817216 = 1045^2 + 904^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909241 - 2¹⁰ = 1908217 is a prime.

It is equal to p₁₄₂₆₆₇ and since 1909241 and 142667 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1909241.

It is not a weakly prime, because it can be changed into another prime (1909231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954620 + 954621.

It is an arithmetic number, because the mean of its divisors is an integer number (954621).

2^1909241 is an apocalyptic number.

It is an amenable number.

1909241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909241 is an equidigital number, since it uses as much as digits as its factorization.

1909241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1909241 is about 1381.7528722604. The cubic root of 1909241 is about 124.0567075000.

The spelling of 1909241 in words is "one million, nine hundred nine thousand, two hundred forty-one".