1261109 has 2 divisors, whose sum is σ = 1261110. Its totient is φ = 1261108.

The previous prime is 1261081. The next prime is 1261121. The reversal of 1261109 is 9011621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 874225 + 386884 = 935^2 + 622^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261109 - 2¹² = 1257013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630554 + 630555.

It is an arithmetic number, because the mean of its divisors is an integer number (630555).

2^1261109 is an apocalyptic number.

It is an amenable number.

1261109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261109 is an equidigital number, since it uses as much as digits as its factorization.

1261109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1261109 is about 1122.9910952452. The cubic root of 1261109 is about 108.0399086620.

Adding to 1261109 its sum of digits (20), we get a square (1261129 = 1123²).

The spelling of 1261109 in words is "one million, two hundred sixty-one thousand, one hundred nine".