1234809109 has 2 divisors, whose sum is σ = 1234809110. Its totient is φ = 1234809108.

The previous prime is 1234809047. The next prime is 1234809131. The reversal of 1234809109 is 9019084321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 872020900 + 362788209 = 29530^2 + 19047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1234809109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1234801109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617404554 + 617404555.

It is an arithmetic number, because the mean of its divisors is an integer number (617404555).

Almost surely, 2^1234809109 is an apocalyptic number.

It is an amenable number.

1234809109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1234809109 is an equidigital number, since it uses as much as digits as its factorization.

1234809109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1234809109 is about 35139.8507253517. The cubic root of 1234809109 is about 1072.8358434067.

The spelling of 1234809109 in words is "one billion, two hundred thirty-four million, eight hundred nine thousand, one hundred nine".