154543116989 has 2 divisors, whose sum is σ = 154543116990. Its totient is φ = 154543116988.

The previous prime is 154543116983. The next prime is 154543117031. The reversal of 154543116989 is 989611345451.

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., 154082156089 + 460960900 = 392533^2 + 21470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154543116989 is a prime.

It is a super-2 number, since 2×154543116989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154543116983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77271558494 + 77271558495.

It is an arithmetic number, because the mean of its divisors is an integer number (77271558495).

Almost surely, 2^154543116989 is an apocalyptic number.

It is an amenable number.

154543116989 is a deficient number, since it is larger than the sum of its proper divisors (1).

154543116989 is an equidigital number, since it uses as much as digits as its factorization.

154543116989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4665600, while the sum is 56.

The spelling of 154543116989 in words is "one hundred fifty-four billion, five hundred forty-three million, one hundred sixteen thousand, nine hundred eighty-nine".