154340561 has 2 divisors, whose sum is σ = 154340562. Its totient is φ = 154340560.

The previous prime is 154340531. The next prime is 154340609. The reversal of 154340561 is 165043451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128686336 + 25654225 = 11344^2 + 5065^2 .

It is an emirp because it is prime and its reverse (165043451) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154340561 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (154340521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77170280 + 77170281.

It is an arithmetic number, because the mean of its divisors is an integer number (77170281).

Almost surely, 2^154340561 is an apocalyptic number.

It is an amenable number.

154340561 is a deficient number, since it is larger than the sum of its proper divisors (1).

154340561 is an equidigital number, since it uses as much as digits as its factorization.

154340561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 154340561 is about 12423.3876619866. The cubic root of 154340561 is about 536.4056679178.

The spelling of 154340561 in words is "one hundred fifty-four million, three hundred forty thousand, five hundred sixty-one".