154944689 has 2 divisors, whose sum is σ = 154944690. Its totient is φ = 154944688.

The previous prime is 154944683. The next prime is 154944701. The reversal of 154944689 is 986449451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98168464 + 56776225 = 9908^2 + 7535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154944689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (154944683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77472344 + 77472345.

It is an arithmetic number, because the mean of its divisors is an integer number (77472345).

Almost surely, 2^154944689 is an apocalyptic number.

It is an amenable number.

154944689 is a deficient number, since it is larger than the sum of its proper divisors (1).

154944689 is an equidigital number, since it uses as much as digits as its factorization.

154944689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 50.

The square root of 154944689 is about 12447.6780565694. The cubic root of 154944689 is about 537.1046325618.

The spelling of 154944689 in words is "one hundred fifty-four million, nine hundred forty-four thousand, six hundred eighty-nine".