154943129609 has 2 divisors, whose sum is σ = 154943129610. Its totient is φ = 154943129608.

The previous prime is 154943129569. The next prime is 154943129611. The reversal of 154943129609 is 906921349451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92520605584 + 62422524025 = 304172^2 + 249845^2 .

It is a cyclic number.

It is not a de Polignac number, because 154943129609 - 2²⁰ = 154942081033 is a prime.

It is a Sophie Germain prime.

Together with 154943129611, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (154943129909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77471564804 + 77471564805.

It is an arithmetic number, because the mean of its divisors is an integer number (77471564805).

Almost surely, 2^154943129609 is an apocalyptic number.

It is an amenable number.

154943129609 is a deficient number, since it is larger than the sum of its proper divisors (1).

154943129609 is an equidigital number, since it uses as much as digits as its factorization.

154943129609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 154943129609 in words is "one hundred fifty-four billion, nine hundred forty-three million, one hundred twenty-nine thousand, six hundred nine".